I think the Sensar IV has the best signal gain of the popular RV anttenae - if the antenna on your Bounder is original equipment, it's probably not a IV model. The IV has the UHF antenna added to the batwing, a three-wing bat if you will. With almost all OTA TV now digital and on UHF, the Sensar IV should give you the best results. I'd replace the whole thing, just because the mechanism on yours is at least 15yrs old and those plastic gears are probably pretty worn by now. And when I did that, I also went with the Winegard Sensar Pro signal strength meter - makes pointing the antenna so much easier.
al