Hi. I am somewhat new to CB and have a quick question. I have a
RadioShack TRC-520 in my pickup. I'd like to replace the cheap plastic
mic w/ a noise-canceling and, if possible, powered mic. Everything I
find says 4-pin or 5-pin, but if I look @ my unit I see 6 pins. What am
I missing here? :^)

Any suggestions on a good model? Thanks.