I wouldn't go to great lengths to experiment with an indoor antenna at your location. Remember, the NM data is what you design to. A net of +10 gives you reliable reception. Being indoors usually knocks off 20 dB, and you wan't be at 20 feet, so subtract a few more dBs. Given that a repsectable indoor antenna provides around zero gain (amplifiers DO NOT HELP!), you're left with one or two stations that you could pick up: WUVG and WGTV.
As far as the outdoor antenna goes, you should buy the 7698P, as you need all the gain you can get for reliable reception on these 2-edge paths.
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