I've come close a couple of times lately to doing that. I fly some of my stuff on 72MHz, and some on 2.4. It's easy to get used to not having that "fishing pole" antenna sticking out when you get used to 2.4, and when you change back, you have to remember the antenna. I've tried to get in the habit of folding the short 2.4 antenna down as part of my procedure, to at least stay conscious of the antenna.