The only thing special about HD from an antenna standpoint is that most of the stations are in the UHF band. Older trailers had antennas that were only for VHF. My trailer had a Sensar antenna that was only for VHF but they sell the "Wingman" attachment which adds UHF. I get good HD reception from up to 70 miles away at home in the Orlando market with it.
"You cannot reason someone out of a position they have not been reasoned into"
Al, K5TAN and Missy, N4RGO
2002 Classic 30 Slideout
2001 Safari 25 RB Twin (Gone, but not forgotten)
2013 Dodge 2500 Laramie 4x4 Megacab Cummins
WBCCI 1322, TAC FL-39, AIR 82265