Glenn,
There shouldn't be any more (or less) interference between the HDTV
antenna and the others than there would be for a 'regular' TV
antenna. As with either type of TV antenna, distance from things
around them will directly affect how much they may be affected by the
'other' antennas simply being there. That says nothing about whether
the ham antennas are in use at the time! (Kind'a figured that anyway,
huh?)
- 'Doc