Hi ichn2go,
This is another vote for a Firestik antenna AND antenna wire kit. Go to
http://www.firestik.com/CatalogFrame.htm and determine which kit is best for you. One may not be able to change just the antenna. Coach manufacturers usually install a ground plane antenna and antenna wire. The ground plane is usually inadequate. This leads to poor performance. I installed the Firestik top loaded, no-ground plane antenna and antenna wire kit. The antenna and antenna wire must be both for a no-ground plane install or a ground plane install. They can not be mixed. Go to
http://www.irv2.com/photopost/showphoto.php?photo=4180 to see the antenna installed. Go to
http://www.irv2.com/photopost/showphoto.php?photo=4181 to see the radio. I use the all in one hand held Cobra. After helping many RVers with their CB radio, I have never seen a bad radio. For me, CB radios are a commodity. Buy the radio that has the whistles and bells you need/want. Every time I have assisted an RVer, the problem has been the antenna and or the wire.
There will, most likely, be extra wire. Do not coil up the extra wire. Lay the wire out flat taking as much room (under the dash?) as needed to use up the extra wire but not coil it. Do not change the length of the wire that came with the kit.