ProStar TV antenna?

So I got a 2011 International Prostar and I think it's pretty cool that it has a coax hookup in the bunk for tv. However, both my mirror antennas have been broken off and all I have is te radio antenna. So, is the radio antenna also te tv antenna cause I do get reception but sometimes it's not the best. Some one told me the thought that one of the mirror antennas was for te CB and the other was for the TV. I'm wondering cause I would like it to be better and if it does share the radio antenna then I'm just gonna buy a powered HD antenna, but if it uses one of the mirror antennas then I was gonna replace that. Any help greatly appreciated.