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If you are going to put the antenna in the attic, I suggest you get a winegard HD7698P (2nd choice would be an antenna craft HBU55 or a winegard HD7697P), and start with pointing it at 347 magnetic, turn it a few degrees and see how reception changes to find the correct angle. In an attic, you may need to experiment with where you place it. I suggest getting an RCA TVPRAMP1R to help overcome any losses in your structured distribution system, unless the structured distribution system has any amplification built in. (A preamp cannot pull in any more signal, but it can help the signal the antenna catches survive cable and splitters into TV’s and devices.) More than 1 amplifier can be a problem unless a system is designed for it, so if the structured wiring system has an amplifier built in, either bypass it, or do not use a preamp.
If you are going to put the antenna on the roof, you might be able to get away with a smaller antenna, but the winegard HD7698P would still be the best bet for getting stations in the main DC tower cluster. Most of your signals are 2edge, so multipath may creep in and the HD7698P would better reject it.
For getting HDTV from an antenna to a projector, I would suggest using windows media center with a HDHR network tuner. My 2nd choice would be a DTV converter box with a HDMI out, such as an Iview 3500STBII.
WDCN-LP is an analog LP station being operated as a Spanish FM radio station. If you have any interest in that, or in FM radio in general, an FM6 antenna would be good to get. Ideally FM would be distributed separate from the TV signal, but since there are not really any VHF low signals in the DC market, a HLSJ could be used to merge the FM6 with a UHF/VHF antenna (with considerations needed for where it is placed with regards to an amplifier for DC power passing).
It is a shame you can’t really get FOX or CBS from Baltimore even at 40’, that would get you slightly different NFL coverage some weekends. (If you wanted Baltimore market stations, you would be looking at a 91XG and an Y10-7-13 as high as you could get them). Even then with co channel interference flags, it would be iffy.
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