Before switching out the antenna I'd follow the suggestions others have made to insure it's not something other than the antenna causing the poor reception...location, correct source selection ("antenna" instead of "cable"), antenna boost is "on", antenna direction, etc.
If you do all of this and still aren't getting reception check with another camper to see if they are getting anything to confirm that it's most likely the antenna and not simply location.
The new antenna I just installed (Jack) has a signal finder to make it easier to find the best direction to point the antenna. There are some 3rd party manufacturers that sell signal finders that can be attached to your existing antenna line in to assist in getting the antenna pointed in the best direction to pull in those signals.