Originally Posted by seatacboy
I purchased a used generic clone four-bay UHF outdoor antenna, which closely resembles the CM 4221 - from another local AVS Forum user. I'm currently evaluating it as an indoor antenna. .....
As an indoor antenna, the problem with using this unit indoors within a small living unit [is that] the unit's size makes it really hard to "focus" in a specific direction to minimize multipath interference.
I'm delighted to update my report! I moved some belongings from a different corner of my north-facing bedroom, and have finally found a position where the CM 4221 clone can pull in a viewable picture on all 14 Seattle-area DTV stations! While reception is not 100% reliable, this is the first time I've actually been able to run a channel scan and obtain a viewable picture on ALL of my local stations. Keep in mind this is a miserable location for DTV, in that my condo unit is a couple of feet below ground, my north-facing view is overlooking a parking lot, and is surrounded by several three-story-high condo buildings and trees.
With the CM 4221 placed near, but not directly in front of, a north-facing window, and without rotating the antenna around - I present signal quality/strength numbers. I'm using EV's signal-quality scheme (1 to 10 signal quality rating) using the same Zenith DTT-900/DTT-901 CECB signal-strength display for each channel:
KOMO 38 7
KING 48 5
KIRO 39 6
KCTS 41 7
KSTW 36 8
KCPQ 18 5
KONG 31 7
KTBW 14 5
KMYQ 25 8
KBTC 27 7
KWPX 32 7
KWBF 42 7
KHCV 44 6
KUNS 50 7
While it is conceivable I had an unusual "good reception" afternoon, I ran similar tests using an RCA ANT-110 and wasn't able to duplicate these numbers. I've finally found a spot where the Channel Master 4221 will get me a total of 14 channels (total of 34 subchannels!).
The used clone 4221 I acquired came equipped with an excellent 3-foot mounting mast, I now need to go to the hardware store to find something like a flag-pole base so the antenna can be placed securely in the bedroom corner without accidentally falling over. I may want to be able to manually turn the position when I want to watch something on KCPQ (Fox) since signal strength can be up around 8 if I rotate it towards the west.
I might still explore getting a Channel Master preamplifier, since there are some breakups caused when neighbors are walking in front of my north-facing window to go to their cars - and since I'd like to split the signal to feed my living room TV with excellent OTA signal.
While this remains a work in progress, yours truly is very happy to report getting viewable reception on a total of 34 subchannels!
P.S. I'm using a 12-foot run of Philips-branded quad-shielded RG6 coax running from the CM4221 to the CECB.