As suggested, I am reposting this here from EV's thread.
I purchased and installed a Monoprice 4730 indoor/outdoor DHTV antenna.
After installing it about 3 feet above the TV upstairs, I found that the channels were frequently pixelating, freezing or going to no signal message.
With a friend, I tried the antenna out of doors (through a bedroom window) on the same floor and the reception was better but still inadequate.
I contacted Monoprice tech support who told me that their antennas are only for "green" and "yellow" channels. Since antennaweb tells me that my channels are red, blue and purple, if they are correct, I need a more "powerful" antenna.
I found this site and thread where people are kind enough to offer advice, so I am submitting my link to tvfool with a request for advice on a suitable antenna and placement.
My house is surrounded by trees which in all directions are higher than the roof (by more than 20 feet). The area is hilly, so I doubt that any transmitter is in direct line of sight.
My link is http://www.tvfool.com/?option=com_wr...7fcf99c735cd96
Thanks is advance for any assistance/advice.