1) When it comes to digital TV reception, there's no "silver bullet" antenna that works uniformly well at all locations. It's a trial and error process. Based on Amazon reviews, certain models do "stand out" but sometimes old-school products like the classic 4-bay CM4221 (and clones) outperform the "new and improved" antennas. I'm currently using a 4-bay 4221 clone mounted indoors up near the ceiling with fairly decent results (14 transmitters, 41 channels) but am planning a rooftop install for more stable reception.
2) Similarly, sites like TV Fool are very, very useful but not 100% accurate predictors of real-life reception at your exact house.
3) Different digital TV tuners have different levels of sensitivity, multipath rejection, ability to cope with signal overload, and so forth. Some CECBs like the Channel Master 7000 might outperform a television's built-in tuner, or vice versa.
4) Outdoor placement above ground level generally trumps indoor placement. If you gotta do indoor placement, signal strength almost always is better placed when near a window, which is why in the past I was able to obtain surprisingly adequate reception in my former SeaTac condo at a certain "sweet spot", even though we were on the south side of the McMicken Heights hill and partially below ground level.
Those of us who are hobbyists can come up with "educated guesses" but pro installers who have rather sophisticated equipment can better determine signal QUALITY, as well as apply seat-of-the-pants know-how that we as hobbyists don't really have.
If you really wanna be Comcast-free (or Millenium-free), it may be worth the expense to get a professional installation.
P.S. The "14 transmitters, 41 channels" using an indoor placement of the classic 4-day is using an average-grade CECB, the RCA DTA 800B. The DTA-800B is pretty good but not the absolute best-in-class for sensitivity. I could get more transmitters, or obtain higher signal strength, using my CM 7000 or some of the tuners in late-model televisions. I dusted off the DTA800 for use during an upcoming rooftop antenna install, in order to evaluate "typical" TV reception (typical of my older Samsung HD set's internal tuner), rather than relying upon the CM-7000 "supertuner" which outperforms most of what's on the market.
As always, your mileage may vary.
Edited by seatacboy - 10/21/13 at 11:18am