Security & Resilience
What "Anti-Jamming" Alarms Actually Do — and Where They Stop
16 July 2026
Alarm companies on the coast now sell "anti-jamming" and "anti-inhibitor" systems, because enough homes have been burgled with a signal jammer that buyers have started asking. If you are shopping for one, you deserve a straight answer to the only question that matters: what does it actually do when someone switches a jammer on?
The honest answer is narrower than the brochure suggests.
What the label really means
An "anti-jamming" alarm does two things, and both are real. First, it detects jamming: when the radio noise floor spikes, the panel recognises the pattern and treats it as an event in itself. Second, it fails over: if its primary connection to the monitoring centre is blocked, it tries another route — a second frequency, a SIM card, your Wi-Fi.
Credit where it is due. A panel with a backup battery, jam detection, and supervised communication — where the monitoring centre notices prolonged silence and treats the silence itself as suspicious — is genuinely better engineering than the previous generation. These are not fake features.
But notice what neither feature does. Neither one lets the system see. Detection and failover protect the alarm's ability to phone for help. They do nothing for the sensors themselves.
The problem is where everything lives
Walk through the parts of a typical wireless alarm. The door contacts and motion sensors talk to the panel by radio — on the same crowded bands as everything else in a modern home. The panel's lifeline to the monitoring centre is a mobile SIM. The fallback is your Wi-Fi router.
Every one of those paths sits within reach of the same inexpensive, multi-band jammer that criminal crews already carry. Jam the sensor band and the system goes blind: the panel cannot report a break-in its sensors never saw. Jam the mobile bands at the same time — the same device does both — and the phone-home dies with it. The remaining fallback runs through your router, which stops the moment the mains are cut at the meter box on the way in.
The backup battery keeps the panel awake through all of this. Awake, blind, and mute. The redundancy is real — it is just stacked entirely inside the radius of the one tool built to defeat it.
And there is a quieter problem underneath. These systems end in a phone call: the monitoring centre notices, verifies, and dispatches. That model assumes there is time — that someone can respond before the visit is over. Crews that use jammers do not pick occupied houses at random hours. They pick the empty villa, the dark second home, the dinner hour — the exact situations where a delayed phone call protects a report, not a property.
What surviving actually requires
The fix is not a better version of the same alarm. It is moving each link off the path the jammer covers.
Detection that does not ride on radio: cameras on cable, with intelligence on board, that keep seeing, deciding, recording and sounding sirens locally no matter what the airwaves are doing. A way out that does not share the attacked spectrum: a satellite uplink points at the sky, not at a cell tower — outside the reach of the handheld jammers used in these burglaries, with no cable at the street to cut. Power that does not depend on the meter box. And a brain that lives on the property and acts on its own, rather than waiting for a human many minutes away.
None of this makes a property immune — nothing does, and we have written before about why "unjammable" is a lie no matter who says it. A determined attacker can always take something down. The design goal is different: to make sure that no single jam, no single cut wire, and no single dead socket ever buys an intruder silence. Something is always still watching, still recording, and still able to reach you.
That is the standard to hold any "anti-jamming" system to — including ours. If you want to see what it looks like on your own property, book a private site survey and I will walk you through exactly which of your current paths survive, and which do not.