THE INVISIBLE FRONT

Electronic Warfare and the Fight for the Spectrum

There is another battlefield running parallel to the one we can see. You won't find it on a satellite photograph. It doesn't have trenches, minefields or tree lines. Most of the time, a soldier cannot see it at all. It exists in the electromagnetic spectrum.

Every radio transmission, drone control link, navigation signal, radar pulse and data connection creates an electronic environment around the battlefield. Modern armies have become enormously dependent upon that environment. And that dependence has created vulnerability.

The war in Ukraine has demonstrated something professional militaries understood during the Cold War but had increasingly taken for granted during decades of counterinsurgency warfare:

If you cannot operate in a contested electromagnetic environment, much of your expensive technology stops being useful.

Electronic warfare is therefore no longer a specialized capability sitting somewhere behind the front. It is becoming part of the terrain.

THE BATTLEFIELD YOU CANNOT SEE

The Wall Street Journal recently described the electronic contest occurring over Ukraine, where Russian and Ukrainian forces are continuously attempting to disrupt one another's communications, navigation and unmanned systems.

The scale is significant.

The modern battlefield contains thousands of electronic emitters: radios, cellular devices, satellite-navigation receivers, radars, drones and other networked systems. Every one of them potentially becomes part of the fight. Electronic warfare generally revolves around three interconnected functions:

Electronic Support — finding and characterizing signals.

Electronic Attack — interfering with or deceiving them.

Electronic Protection — keeping your own systems functioning despite enemy interference.

The three feed each other:

• Detect 
• Analyze.
• Disrupt.
• Adapt.

Then the opponent changes something and the cycle begins again. That last part is critical.

Electronic warfare isn't a problem that gets permanently solved. It is a competition.

THE DRONE WAR CHANGED EVERYTHING

The explosion of inexpensive unmanned aircraft has dramatically increased the importance of electronic warfare. A conventional artillery projectile doesn't require a radio connection after it leaves the barrel. A remotely operated drone often does.

That creates an opportunity. Instead of physically destroying the aircraft, defenders may attempt to interfere with the electronic systems that allow it to operate. But the relationship cuts both ways.

Drones can also become electronic reconnaissance platforms. Aircraft carrying relatively inexpensive receivers can search for emissions from radios, radars and other equipment. In a battlefield saturated with sensors, transmitting can therefore reveal information about the transmitter. The old radio discipline lesson has returned with considerably greater consequences:

Every transmission potentially tells someone that something is there.

Not necessarily who you are. Not necessarily exactly where you are. But something transmitted. And somebody may be listening.

THE JAMMER IS NOT A MAGIC SHIELD

One dangerous misconception is that electronic warfare simply means buying a jammer. Ukraine demonstrates why that assumption is wrong. Once one side develops an effective method of interference, the other side begins changing its equipment and procedures.

Control methods change, navigation methods change. Software changes. Autonomy increases. Then the jammer must change.

The WSJ describes this technological competition in Ukraine particularly well. Ukrainian engineers developed systems intended to interfere with Russian weapons and unmanned aircraft. Russian designers subsequently introduced increasingly sophisticated anti-jamming equipment. Ukrainian engineers responded with additional countermeasures.

Neither side gets the final word & that is the nature of electronic warfare.

Countermeasure produces counter-countermeasure.

Then counter-counter-countermeasure. The cycle continues until the war ends.

SPOOFING: SOMETIMES DECEPTION BEATS NOISE

Electronic attack doesn't necessarily require simply overpowering another signal. Another approach is deception. Instead of preventing a receiver from hearing something, an electronic-warfare system can attempt to make the receiver believe false information.

Satellite navigation provides an obvious example. Jamming essentially tells the receiver:

YOU CAN'T HEAR THE SIGNAL.

Spoofing attempts to tell it:

HERE IS THE SIGNAL — TRUST THIS ONE INSTEAD.

That distinction matters. The WSJ report describes Ukrainian systems being credited by their operators with using electronic deception against Russian weapons, including claims involving sophisticated missile attacks. The effectiveness and attribution of individual interceptions can be difficult to independently establish, and electronic warfare is not a replacement for conventional air defense. But the broader development is important: navigation itself has become something that combatants actively attack and defend.

For forces accustomed to GPS always working, that has enormous implications. Coordinates may be wrong, navigation may disappear. Timing references may become unreliable. Digitally synchronized systems may become degraded.

The answer isn't abandoning technology. The answer is learning to operate when technology becomes unreliable.

THE RETURN OF ELECTRONIC EMISSIONS DISCIPLINE

For twenty years, many Western troops operated against enemies with relatively limited electronic reconnaissance capabilities. Radios worked, GPS worked. Satellite communications worked. Electronic emissions were often treated primarily as a communications issue.

A peer battlefield changes that calculation. An emission can become information. A transmitter can potentially indicate activity. Repeated transmissions can establish patterns and patterns can reveal networks. This is one of the core lessons contained in The Guerrilla's Guide to Signals Intelligence. 

Networks can help an adversary understand organization. This makes communications discipline more than simply speaking briefly on the radio. The broader principle is:

Transmit deliberately.

Electronic signatures should increasingly be thought of in the same way troops think about visual signatures. A white light at night is a signature. Movement across an exposed ridge is a signature. A vehicle sitting in an open field is a signature. And an unnecessary electronic transmission is also a signature. The difference is that you cannot see it leaving the antenna.

THE CAT-AND-MOUSE GAME

Electronic warfare creates another interesting consequence. Success can destroy itself. Suppose a particular countermeasure becomes extremely effective. The enemy eventually recognizes what is happening: They change. This is exactly what the Ukrainian battlefield has repeatedly demonstrated.

Electronic systems are consequently becoming increasingly software-defined and adaptable. The advantage goes not merely to whoever owns the most powerful transmitter, but to whoever can observe changes, understand them and respond faster.

That means the electronic warfare cycle increasingly resembles intelligence work:

COLLECT → IDENTIFY → ANALYZE → RESPOND → ASSESS

Equipment matters. But the organization behind the equipment matters more. A mediocre system supported by people continuously studying the spectrum may ultimately be more useful than sophisticated equipment operated according to procedures written three years earlier. The spectrum doesn't care what the manual says. It reflects what is happening right now.

THE COUNTERMEASURE TO ELECTRONIC WARFARE

The most interesting development may be what happens when forces attempt to leave the radio spectrum altogether. Fiber-optic-controlled drones are one example. Instead of relying upon a conventional radio control link, some aircraft maintain a physical fiber connection to the operator.

No radio control link means there is no conventional control signal to jam. The solution introduces new problems — physical tethering, maneuverability and other limitations — but it demonstrates the larger pattern.

Every electronic attack produces pressure toward another technical solution.

Another approach is autonomy. If an unmanned aircraft can navigate and recognize a target without maintaining continuous communication with its operator, disrupting the control link becomes less valuable. That creates an uncomfortable trajectory for warfare. Electronic warfare encourages autonomy. The better jamming becomes, the greater the incentive to develop machines that don't require constant communication.

ARTIFICIAL INTELLIGENCE ENTERS THE SPECTRUM

Humans are increasingly struggling with the volume and speed of signals appearing on modern battlefields.

Software can help. Machine-learning systems can potentially assist operators in classifying signals, identifying patterns and detecting changes in the electronic environment much faster than a person manually examining every signal.

The opposing side can use similar techniques. Electronic warfare therefore becomes a machine-speed competition. One system searches for a signal. Another changes its behavior. One attempts to classify it.

Another attempts to appear differently. One identifies interference. Another attempts to route around it. The electronic battlefield increasingly begins to resemble cyber warfare conducted through antennas.

CHEAP SYSTEMS CHANGE THE ECONOMICS

Another lesson from Ukraine is economic. Destroying inexpensive drones with extremely expensive interceptors is difficult to sustain indefinitely. Electronic warfare potentially changes that equation. If one reusable electronic system can disrupt numerous incoming unmanned aircraft, the cost-per-engagement can become dramatically lower than firing a missile at every target.

But there is no free lunch.

Electronic warfare can interfere with friendly systems. It can reveal the presence of the jammer. It may become ineffective when enemy technology changes. And it may have little effect against systems designed specifically to operate without the vulnerable link being attacked. Electronic warfare should therefore be understood as one layer of defense rather than a magic answer.

Detection - Electronic countermeasures -  Physical concealment - Passive protection. And conventional defeat mechanisms. They complement one another.

SPECTRUM AWARENESS BECOMES A BASIC FIELD SKILL

Perhaps the biggest lesson isn't technological at all, it is educational. For years, electronic warfare was treated as a specialist discipline. That distinction is becoming harder to maintain. A soldier doesn't need to be an electronic-warfare technician to understand that transmitting creates a signature.

A drone operator should understand that control and navigation links can disappear. A team leader should understand that GPS cannot be assumed. A communications specialist should understand that changing the waveform doesn't eliminate the electronic signature. And anyone operating electronic equipment should understand that the electromagnetic environment can change without warning. This leads to a broader concept:

Spectrum awareness.

You don't necessarily need to dominate the electromagnetic spectrum. You need to understand that you are operating inside it.

THE SMALL-UNIT LESSON

For small teams, the lesson coming from Ukraine is not "buy a bigger jammer." It is much simpler: 

Know what you are emitting.

Know what you depend upon.

Know what happens when those systems disappear.

Communications should have alternatives. Navigation should have alternatives. Observation should have alternatives. And procedures should exist for operating when electronic systems stop behaving normally. This is basic redundancy applied to the digital battlefield.

If GPS disappears, can you navigate? If a radio network becomes unreliable, can the team continue operating? If a drone loses connectivity, does the mission collapse? If digital mapping stops working, does anyone have another method? Those questions matter far more than owning the newest piece of equipment.

THE ELECTROMAGNETIC TERRAIN

The military vocabulary of terrain traditionally describes hills, valleys, rivers, roads, vegetation and buildings. Modern forces need another layer: 

Electronic terrain.

Signals occupy space. Their usefulness changes with distance, geography, equipment and interference. Transmitters create signatures. Receivers create opportunities. Networks create dependencies. Jammers alter the environment. None of it is visible.

But neither is wind, and nobody operating a rifle at distance pretends wind doesn't exist simply because they cannot see it. The electromagnetic spectrum needs to be viewed the same way. It is part of the environment.

THE LESSON FROM UKRAINE

 

Each drone mission consists of reconnaissance, preparations and hours of drone crew work, which all together concentrate to several seconds of attack. Ukrainian SOF: Always Beyond! https://t.co/d9FezhY8Cd

— 4th Ranger Regiment SOF Ukraine (@Rangers_uasof) September 24, 2026

 

Ukraine isn't demonstrating that electronic warfare will replace conventional warfare. It is demonstrating that electronic warfare is becoming inseparable from it. Artillery still matters. Infantry still matters.  Air defense still matters. Drones certainly matter. But increasingly, all of them depend upon information moving through the electromagnetic spectrum. And anything you depend upon becomes something the enemy will attempt to attack.

The electronic battlefield therefore rewards organizations that can learn quickly. Observe the environment. Identify the change. Adapt equipment and procedures. Repeat.

The equipment that dominates today may be obsolete six months from now. The frequency that is quiet today may be crowded tomorrow. The communications method that works perfectly during training may disappear five minutes after the shooting starts. There is no permanent technological advantage. There is only adaptation and that may be the most important lesson emerging from the invisible war being fought over Ukraine.

The electromagnetic spectrum is terrain.

Your transmissions are signatures.

Your networks are dependencies.

And the enemy gets a vote.

See you in class. -NCS