When I was a fairly new ham, I got a cheap side squeeze type cell phone holder for my HT (I think it was an Icom IC-2a at the time, though I continued to use the same mount with my VX-7) a pretty heavy brick of a HT it used a BNC connector, so I got a BNC adapter for my external mag mount antenna. When I was playing on rough surfaces I would wrap a heavy rubber band around the radio and mount below the control pad. I never had the radio come loose no matter how bouncy the roads. After I got my first vehicle mounted radio, I would just stick the HT between the seat and console, but I expect if you find a suitable cell phone holder, it will do the job for whatever HT you wish to use.