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So you particularly want WETA 27 and WPXW 34. I'd say you have quite a good chance of receiving them if you mount a large directional UHF antenna outdoors pointed at the horizon at compass 218, in clear air above any trees or building obstructions. The small indoors antenna you are suggesting, or putting the antenna inside, or both, will make your chances of success very very slim, IMO.
Not part of the industry, but I am a professional engineer, and have picked up some understanding hanging around this forum. The TVFR is a simulation, and does not account for signal reducing ground features like aiming through trees and buildings. Usually an attic installation will work for someone who has strong local signals (green zone), does not have a bunch of trees around their building, and whose roof and sidewalls are made of comparatively transparent materials like wood, vinyl and asphalt shingles. So, that seems to be in your favor. Still, antenna performance in attics will be difficult to predict, ie usually worse than you expect. Also realize that the scale of signal on the TVFR is in decibels, which increases logarithmically. So we are talking about huge differences in power when we compare your green Baltimore stations to the weak pink stations.
If I wanted to try the attic installation, I would get an Antennas Direct DB8e and mount it in the attic, clear of any obstructions or metal, pointing at the desired stations. Then, if that did not work, I could move it outside on the roof and give it another try.
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and not ready to invest in an installer if I don't have to). The DC channels are those at about 207 Azimuth and about 30ish miles away. I am specifically desiring ION and WETA.
