Glad you had some success with the outdoor antenna. If you still have occasional video dropouts, I would try a mast mounted pre-amp to see if that helps improve the signal quality. Using a Channel Master 7775 (UHF only) pre-amp in SoCal made a big difference for me. Because of your station frequencies, you may need the VHF/UHF Channel Master 7777 pre-amp for your location. Here is a url:http://www.solidsignal.com/search_re...&SiteREF=SSCOM
Installation of the pre-amp with the same outdoor antenna allowed me to receive two more stations in my location.
If this doesn't help, I would suggest calling a pro installer that has a portable RF Spectrum Analyzer. These are battery operated devices that use a small hand held antenna to look at signal strengths as you move the antenna and unit around your property; multiple stations can be seen at the same time.
By just various locations on your property (roof and ground areas) he may well find a "sweet spot" for the antenna, based on your desired stations and the surrounding terrain. I recently had an installer use one of these at my house. I was amazed at how much difference in signal quality there was on some hard to receive stations with small (10-30 feet) changes in location on my roof.
Like you, my reception situation is based on reflected signals, as I have no line of sight shots to either of the two tranmission towers in my area.