My set up is an Autocom Super-Pro Avi, which is the only model in the current range to have a metal casing that also acts as a heat sink when bike-powering my 6-yr old ICOM F4 (equivalent to a Kenwood TK3201) - I have never battery-powered the radio. Bike-powering is convenient because there is only one lead to connect, saved £30 on a battery pack, and helps with interference. I'm also using a push-to-talk button so that rider-to-pillion speech is not commicated to the rest of the group. Range is good - 2 miles on the flat but much less in the hills.