Along with a higher gain antenna, I use an old Radio Shack HTX 20 amp. Found for around $50 on your favorite online auction or ham based classifieds. Gives 30 watts out for 5 in and only draws 6 amps. I use one with my Baofeng uv5ra and have no problem with it pluged into my acc plug in the dash..reaches repeaters with ease which I could not get before.