I've got a 2001 Century class freightliner with an '06 Showhauler on it. The truck was refurbed by Freightliner and I want to install a CB radio. I found the splitter box behind the dash where the antenna leads go into and there are 3 outputs. 1 for the AM/FM radio and 2 others. I assume one for phone ??? and one for the CB. The question is, is one of these for the CB and if so why is the connector for the small diam. coax cable. Any help is appreciated. Thx, Dave...