Solution for obstructed path?

How bad do you want it? You can buy a used CRT spectrum analyzer on eBay for typically a couple hundred bucks or so and move the antenna to where the "boxcar" image of the channel you are trying to receive looks flattest.

Back in analog days, I used to live in a place with lousy reception, so I hung a loop antenna from my curtain rod and whenever I changed the channel, I'd use a broom handle to slide the loop antenna back and forth along the rod to zero in on the best reception for that channel.

I'd try something better than a $10 antenna.
You might be surprised.....signals do a "knife-edge" propagation over and around barriers, and ATSC Digital signals don't have to be perfect, to decode.

Feel free to edit your previous post each time a new thought comes up...

We'll need to see an exact address TVfool plot for your location

If your TVFool is correct, you should be able to get most of the channels in green/yellow on your report, with this antenna and this preamp.

See this article about reception when hills are in the way. A hot spot near the ground may work as well as a really tall antenna.

Indoor reception is impossible to predict, particularly in your case, as all of your "green" stations are in the VHF band. VHF often has a harder time passing through building materials than smaller wavelength UHF channels. Concrete, metal and stucco, in particular are good signal blockers.

You can always try an indoor antenna. Locating it near a NE-facing window and away from any electrical/electronic devices may be your best location. Add a longer coax, if needed.

Avoid amplified antennas. In your case, they may make reception worse, not better. A simple passive VHF/UHF antenna would be a good choice.

I use two attic antennas (CM4221 and Y5-7-13) and I get all the local stations that are not low power. See my TVFool results for my location. All the local channels are not LOS, yet, I can still receive them and all my signal levels are lower than yours so you have a very good chance of receiving them with an attic antenna.

http://www.tvfool.com/?option=com_wr...60b529e3717331

The antenna setup retiredengineer suggested or the one I suggested should work well. Try without a preamp first, then add one, if needed (channels freezing or dropouts).

TV reception hasn't changed. Digital TV is received the same way analog was. If you have VHF channels (which most of your majors are), lots of metal (old-school antenna) in the air still works best. There is no such thing as a "digital" antenna, contrary to all the ads and hype you see in online antenna sales websites and ads.

Your answers have kinda beaten around the bush, so I will too

The problem with amplifiers is that they are not "ideal", they do things other than amplify.

A strong signal, in or out of band, can overload the input resulting in harm to weak signals.

Your TELEVISION signals do not look like they will cause much damage per your TVFool results. FM signals are a problem sometimes, and even your balanced (relatively speaking) TV levels may not be consistent. IF you get an amplifier, don't buy the high gain junk everywhere on eBay. 10dB SHOULD be more than enough to overcome cable losses and put low noise gain near the antenna.

MANY years ago, I was involved in low noise amp designs. We did several things to minimize but not always eliminate problems.

Filter out of band offenders
selectively attenuate in band offenders
amplify as closely to the antenna as practical
ensure amplified output did not reach receiver overload levels

Commercial high quality amplifiers can (economically) do all of these BUT the selective attenuation. That takes technology and money ... AFAIK it's still analog for RF frequencies of interest. It has become digital for audio, and is (by many measures) very economical.

Please post back with your results, so others may learn from your experience.

I know you plan to install it on the roof, but:
Inside the house, if you only tried the antenna in one spot (regardless of angle or direction), it was likely sitting in a dead spot.