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the PLL in this radio is not controlable. So there is no simple way to mod it for channels. The may be an expo kit that can do it, or you can use another crystal to alter the mixing crystals frequency to change the working frequency, but I couldn't tell you exactly what. Its something where some math is required and tinkering.
if you want extra channels, it may be easyer to just get another radio that you can be expanded. plenty of radio's are and some are very easy. For instance Galaxy and ranger's are very is. Its as easy is intrupting a wire with a swith in them.
If your setup is able to rx and tx with no problems, sounds like his coax or antenna is bad. First, I'd try out his radio in your vehicle, since you know yours is working good. Just to see if it rx and tx good. If so, I would check his antenna and coax to see if they are good.