I run a Magnum S9 in my Lincoln with a Texas Star DX500 with a 102" whip with a Gunny corona ball, 6" riser, and a Gunny puck mount on my trunk lid with a ground wire from one of the puck mount bolts to inside the trunk under the package tray to ground my trunk lid to the rest of my car. The radio swings to @ 40 watts and with the radio dead key turned down to 2 1/2 watts I get about 450 to 500 out of good clear audio. Also, the S9 has the least amount of background noise of all the radios I have owned so far.