What is lost in an antenna tuner? Ok, say you have an 1/2 wave dipole on 40M, and it is cut for a good SWR @ 7.150 MHz. The build in tuner has no problem finding a match for the antenna. Now say I want to use it on some other band, 15M, and the tuner also finds a match, but it takes a while and I now have a little buzz in the computer speakers near the radio. Power output on the rigs meter is 100W for both. Is the antenna still radiating 100W on both bands? Would a 1/2 wave dipole cut for 15M be better? by how much. And how do I get rid of the buzz in the speakers? I already have ferrites on the cables going to the speakers.