I just flew through several US and Canadian airports (in fact I am still languishing in one thanks to Air Canada's ineptitude) with a variety of radios, including two Home Patrols, a PSR800, a PSR500, a 396XT, and a Yaesu VX-8GR - and all the cables and chargers for each, as well as RH-77 antennas for every one of them (antennas about 14-16" long). All of this plus a netbook, iPad, and iPhone were in a typical "book bag" sized backpack.
YYC (Calgary) - no problems, had to study the bag in x-ray a little longer than other peoples' gear.
SEA (SeaTac) - not even a second glance.
ATL (Atlanta) - no problems.
TPA (Tampa) - Swabbed the bag and a quick peek inside to look at the three or four sets of spare AA batteries in plastic cases.
PHL (Philadelphia) - no problems.
YYZ (Toronto) - no problems.
None of it except the iPad and netbook were taken out of the bag at any checkpoint. I did not use any of it in flight except the netbook and iPad either.