They can, in fact, determine your location in the time it would take you to send a useful message. They can also jam the airwaves. Why do you think the Iraqi military became paralyzed very early in Gulf Wars I & II?
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.