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Have you ever done a signal foxhunt? It involves a small dish and headphones, and if you’re using a VLF signal with CW (Morse), it’s going to sound very faint.

If you’re broadcasting from a radio shack on a few hundred or thousands of dollars of high end radio equipment with a static tower, Yagi, etc., then yes, they’ll find you.

If you’re on a tri-band HT in your car broadcasting on 440/220/SSB traveling at 50-60 MPH, not only are they going to have a devil of a time finding you, they’re not going to jam anything.

This is why I said LEARN HAM RADIO. I’m not saying, “Go buy a radio just to have it.” I’m saying “learn the science of radio.” When the SHTF, you’ll have a skill that will be in high demand, equipment that could save lives, and likely a leg up on the enemy since most “kids” (20-somethings) wouldn’t know the difference between Morse code and a tripped car alarm.

In Gulf War I, AWACS aircraft would send targeting information to aircraft and ground-based artillery to take out convoys. The targeting was only for trucks laden with cargo. The AWACS could tell the difference based upon the difference in the electrical ignition noises made by a laboring engine. The AWACS instrumentation is cryogenic in order to attain near-theoretical sensitivity of both optic and radio equipment.

If you make weak enough radio signal to be heard but a short distance, you'd be better off just passing a note or talking to the recipient. When the SHTF, you won't be traveling at 50-60 mph because you will prohibited from doing so. The US military can hit moving vehicles with a single shot; and, plenty of evidence was shown about that in GW I & II.

I know the science of radio.

I suggest that clusters of people learn to make and use scratchpad cyphers and establish old-fashioned "drop boxes". Electronic surveillance is well beyond what most people think.