The CAT-5 answer would be a cheap and quick way to solve your problem.... but what if? Once you connect this way then you're locked in to this fixed frequency, power or whatever. I like the Kenwood cable package for my TM-V7A. The price only hurt for a little while. :-)
Can you elaborate a bit on this? I'm not sure I can see how using a CAT-5 extension cable has anything to do with frequency or power, or that it locks you into anything.