I just installed my CM 4228 this evening in the attic and I can only get 2-3 digital channels. I can get 21.1 @ 70%, 42.1 @85% (if I can get it at all), and 68.2 (which is crap anyway). When performing a digital scan on my receiver, I come up with 21.1, 42.1, 50.1, 68.1, and 68.2. - 50.1, 68.1, and 68.2 never come in. The farthest tower is 4.6 miles from my house (Crestline Park - North Mountain Brook), so I am wondering if the CM 4228 is too much and I am shooting past the towers in one directional rather than being a small multi-directional. Can anyone please shed some light on the matter given my location? Thanks.