Since my TV antenna was damaged by an ice storm, I needed to build an HDTV antenna. While searching, I found some HDTV antenna builds that used coat hangers. Being 70 miles away from the HDTV stations, I definitely need my HDTV antenna to be outdoors.
Gray-Hoverman is an easy to build wideband UHF antenna. By adding some additional elements called NARODs you can also receive VHF band. The antenna offers sufficient gain for DVB-T, ISDB-T and ATSC reception.