Have flown often with radio gear for decades now. +1 on setting them to NOAA channels if they want a demonstration. I have traveled often with radio gear, to include communications service monitors. Atlanta was fine. The only time anyone asked about the service monitor was in Hawaii, they just wanted to know what it was. Scanners, they understood could be used to monitor and test radios. Radios, well many people use them. Motorola radios let them know you are serious, and it is expected to be in carry on, many are not cheap. Cheaper ones, like the Chinese models mean you are a hobbyist, and usually get no real scrutiny.
Scrutiny by TSA and other people was minimal, sometimes additional hand search. This stopped once I began carrying a Harris Unity radio though, they thought I was there to inspect them. Very few, except the federal government can afford Harris products.