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Back in the days of analog broadcasting, you would have 'snow' and other types of interference show up in the picture... With digital broadcasting you'll often get a perfect picture or none at all. You either get enough error free data to decode the signal or you don't. If the signal is right on the 'edge', you can expect the video and audio to pixelate or freeze when too many errors are received.
So, if you opt for a single antenna such as the 7698, you may still receive a few of the DC signals even though you aim at Baltimore.
Trees behind the antenna are far less trouble than those the antenna is aimed at. Tilting the antenna up is not likely to help except when dealing with solid terrain. Always fine tune the final aim once you have the system together. Many TVs have some sort of signal meter, if available have a helper at the TV report the signal quality as the antenna aim is adjusted left and right to find the point that gives the best results on the majority of channels.
Satellite system coax is fine for OTA signal distribution as is the coax used by the cable company. Don't mix cable/internet signal on the same coax. Many of the accessories used in a satellite system will need to be removed because they will block OTA frequencies. If disconnected, cable TV splitters are fine for use in an OTA system
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If the well is dry and you don't see rain on the horizon, you'll need to dig the hole deeper. (If the antenna can't get the job done, an amp won't fix it.)
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