Hi All:
Thanks for the initial advice. In answer to your questions...
I mentioned "privately-owned DVR" to emphasize that it is not one owned by a cable company.
I am not at home, so I can't look up model number of DVR or TV, but the TV is a RCA wide screen HD. The DVR is Magnavox, and remember, it is the DVR that is picking up the antenna signal.
I did a TV Fool signal report, and its url is
http://www.tvfool.com/?option=com_wr...46aefef26dbfee
As I read this report, it is telling me that all the channels I want should come in green (strong signal) with an indoor bunny-ears. Instead, I have a roof-mounted aerial and am only picking up ABC and NBC...at least that is all the channels my DVR senses when I run the "find channels" routine within it.
I did try hooking the aerial coax directly to the TV and letting the TV search for channels and got essentially the same result. The TV found ABC, NBC, and some spanish-language channels, but not the other network or local broadcast channels.
As per "Ad Tech"s advice, I will try unplugging amplifier and see what happens.