Ironic you should mention this. I went to IWCE this year, and leaving ATL I had zero issues with my APX8000, XL-200P and Icom IC-80AD, along with my Windows Surface tablet, Ipad, and three Lithium Ion battery packs, various chargers, Bluetooth headset, and a small Canon Elph digital camera- all neatly packed in my backpack as carry on. Went through HJIA without an issue.
Now leaving McCarran to go home, not the same. As soon as I was in line, the TSA said "new rules: all personal electronics needed to be removed from baggage, placed in a bin, and run through separately". This was announced right after I put my bag on the conveyor belt. As soon as it hit the X-ray, some TSA minion got freaked. I advised them who I was, and that my credentials were in the same bin as my bag (which they could clearly see the outline of a badge on the monitor). I stepped aside, they were just about to start putting me through a complete search, when a LVMPD officer stepped over and asked who I was. Told him who I was, and why I was there. He waved me through and got a "get out of getting your privacy invaded for free" card. Keep in mind, this was in March well before the mass casualty incident this month.
Moral of the story, it all depends who is working that day and what airport you are at. ATL is the busiest airport in the world. Just be prepared to explain what you have any why you have it. If you're a ham, it wouldn't be a bad idea (though not required) to show your ham ticket just to ease someone's concern and make life easier for you.