I've heard of a mod trick that includes taking your box apart and messing with it with a screw driver and it's suppose to give you the max miles that you can pick up, from what I've heard after my friend had his radio done he was able to talk to people from about 20 miles away cleary???
I talked about 20 miles on my Uniden PC66XL today (102" whip) I clipped the modulation diode and removed the core from the coil. But, there was little background noise. on channel 32.