Should You Disconnect Your Antennas During Thunderstorms?

If there’s one topic that every experienced radio operator eventually develops strong opinions about, it’s thunderstorms.

Whether I’m operating HF, listening to shortwave broadcasts, experimenting with SDRs, or monitoring utility stations late at night, there’s always one thing in the back of my mind during storm season: lightning.

Over the years I’ve noticed that newer operators often assume that proper grounding alone completely protects radio equipment. Good grounding absolutely matters, but it’s only one layer of protection. A nearby lightning strike can still destroy radios, power supplies, SDRs, computers, network gear, and antenna rotators in an instant.

The simple truth is this:

If a thunderstorm is close enough that I can hear thunder, I disconnect my antennas.

That practice is common among experienced ham radio operators and shortwave listeners alike. In a recent discussion among operators, nearly everyone reported disconnecting antennas and power during storms, even when stations were fully grounded and protected with surge suppressors.

Why Lightning Is So Dangerous to Radio Equipment

Many people think a direct strike is the only threat. It isn’t.

The real danger often comes from:

• Nearby strikes
• Ground potential differences
• Induced voltage on long wire runs
• Electromagnetic pulse effects
• Surges entering through power lines
• Static buildup on antennas

An outdoor antenna is essentially a giant collector for electrical energy. Long-wire shortwave antennas, dipoles, verticals, loops, and tower-mounted beams all create pathways for voltage spikes.

Even a strike several hundred feet away can induce enough voltage into coaxial cable to destroy sensitive electronics.

Modern SDRs are especially vulnerable because many front ends use tiny surface-mount components with very low tolerance for voltage spikes.

What Proper Grounding Actually Does

This is where many operators misunderstand station protection.

Grounding helps redirect electrical energy away from equipment and reduces the chance of catastrophic damage to your home or structure. It does not guarantee your radio survives a lightning event.

One operator summed it up perfectly in a Reddit discussion:

“Grounding, bonding, and suppressing is meant to save your house from a direct hit. Not your radio.”

That statement is brutally accurate.

A proper station ground should include:

Protection Component	Purpose
Ground rods	Dissipate energy into earth
Bonded grounding system	Prevent dangerous voltage differences
Lightning arrestors	Divert surge energy
Coax grounding blocks	Ground feedline entry points
Surge suppressors	Protect AC mains
Single-point ground	Reduce ground loops

But even with all of that in place, many experienced operators still disconnect antennas manually during storms.

And honestly, I think that’s the smartest approach.

I bought myself one of each of these for what they’re worth-

The Difference Between Nearby Strikes and Direct Hits

There’s an important distinction here.

Nearby Strike

A nearby strike can:

• Induce voltage into coax
• Damage radio front ends
• Destroy Ethernet-connected equipment
• Kill power supplies
• Cause static discharge arcs

But your protection system may successfully reduce or absorb much of the energy.

Direct Strike

A direct strike is a completely different situation.

A lightning bolt can carry hundreds of millions of volts and tens of thousands of amps.

No consumer-grade radio equipment is designed to survive that.

If lightning directly hits your antenna or tower, there’s a very real chance that:

• Radios are destroyed
• Coax vaporizes
• Rotators fail
• Network gear dies
• Power systems are damaged
• Fire risk increases

That’s why many operators disconnect antennas entirely during storms.

What I Personally Disconnect

When severe storms move into the area, I disconnect:

• Antenna feedlines
• SDR antennas
• External tuners
• Rotator control cables
• Power supplies
• Ethernet cables connected to outdoor devices

A surprising number of failures happen through network cables and USB connections, not just coax.

One operator in the discussion mentioned losing a rotator controller because it remained connected during a storm while everything else had been disconnected.

That’s a perfect example of how lightning damage often finds the weakest remaining path.

What About Shortwave Listeners?

Shortwave listeners sometimes assume they’re less vulnerable because they only receive and don’t transmit. Sorry, no.

Unfortunately, lightning doesn’t care whether your antenna is connected to a receiver or a transmitter.

In fact, many shortwave listening antennas are long-wire designs stretched across yards or rooftops. Those can accumulate substantial static charge even in non-storm conditions.

If you use:

• Long-wire antennas
• End-fed wires
• Magnetic loops outdoors
• Active antennas
• SDR receivers with outdoor feedlines

…you should absolutely think about storm protection.

A Real-World Example From My Own Experience

Years ago I had a nearby lightning strike during summer storm season.

It wasn’t a direct hit. In fact, the strike likely landed several houses away.

But the surge came through the power system and caused enough electrical noise that multiple electronics in the house rebooted instantly. My Nest thermostat was fried. After that experience, I became far more disciplined about disconnecting equipment during storms.

I know operators who lost:

• HF radios
• SDR receivers
• Modems
• Routers
• Computers
• Antenna switches

…from nearby strikes alone.

One operator in the discussion reported losing an IC-7300 mainboard after lightning damage, despite having station protection measures in place.

That’s not unusual.

The Safest Way to Disconnect Antennas

Timing matters.

Several operators described receiving shocks while disconnecting antennas too late during approaching storms.

That’s extremely dangerous.

If storms are already overhead, avoid handling outdoor antenna connections entirely.

My general rule is:

• Disconnect early
• Reconnect later
• Never work antennas during active lightning

Where Should You Put the Loose Coax?

This is another question operators debate constantly.

After disconnecting coax indoors, I never leave connectors hanging near equipment.

Instead, I prefer:

• Grounded bulkhead panels
• Coax grounding switches
• Feedline entry panels
• External grounding bars

The goal is to give any induced voltage a preferred path to ground instead of through your equipment.

Lightning Protection Devices Worth Considering

No device guarantees total protection, but these can significantly reduce risk.

Device	Purpose
PolyPhaser arrestors	Divert coax surges
Gas discharge protectors	Absorb high-voltage spikes
Coax grounding kits	Ground feedlines
Surge-protected power strips	Protect AC lines
Grounded antenna switches	Safely isolate radios
Single-point entry panels	Centralize grounding

For tower operators, professional-grade grounding and bonding become even more important.

Remote Stations and SDR Setups

Remote radio systems introduce additional vulnerabilities.

Modern setups often include:

• Ethernet-connected SDRs
• Remote switches
• IP rotators
• PoE injectors
• Outdoor network hardware

Lightning can travel through any of those paths.

One operator in the discussion mentioned operating remotely with a fully bonded and surge-protected station while also carrying specialty insurance coverage for equipment.

That’s becoming increasingly common for large modern stations.

Storm Risk by Geography

Where you live matters.

Operators in:

• Florida
• Gulf Coast states
• Southern Ontario
• Midwest storm corridors
• Mountain regions

…often experience much higher lightning activity.

If you operate in high-risk areas, disconnecting antennas should probably become routine practice.

My Practical Rule for Thunderstorms

After years in the hobby, my approach is simple:

If I hear thunder, I disconnect.

It only takes a minute, and that minute can save thousands of dollars in equipment.

Even if your station includes:

• Ground rods
• Bonded systems
• Surge arrestors
• Lightning suppressors
• Proper coax grounding

…disconnecting feedlines still adds another important layer of protection.

No grounding system is perfect.

Finally

Both shortwave listeners and amateur radio operators eventually learn the same lesson: lightning deserves respect.

Grounding matters. Surge protection matters. Bonding matters.

But physically disconnecting antennas during storms remains one of the simplest and most effective protections available.

Experienced operators have seen too many destroyed radios to ignore the risk.

And honestly, once you’ve seen lightning damage firsthand, disconnecting your antennas stops feeling inconvenient very quickly.

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