You mention "wavy lines" and "static"...those don't exist on a digital carrier, so I assume that you are looking at analog translators or LP transmitters. The best RV antenna is still the Winegard Sensar Batwing with the Wingman that Roy showed above. Additionally Winegards Sensar Pro Signal Finder/ preamp is well worth the investment. Where we are presently camped there is a very fine line in the gain set of the preamp. 15 is too weak, and 17 is a shade too strong. 16 brings in an almost flawless picture.
PS- The number of stations may be 90% UHF in RGV, but that is not the case nationwide. VHF is alive and well and will be getting plenty more stations if the FCC has their way. Make sure your antenna performs well on VHF as well.