I live in Eden Prairie and just bought a silver sensor and here's my story:
Bought a HDTV 2 weeks ago and placed it in the basement. I first tried a $50 Radio Shack directional antenna with amplifier (it looked cool, like starship enterprise) which pulled all digital channels, no problem. HDTV was real nice. However, I wasn't sure if I wanted a $50 antenna, so I returned it after a week.
Then last week I bought a silver sensor. I can only pickup 4.1 and 9.1 in HD. Dunno why I get only 2 of 6 or so channels available; I was under the impression that if you pulled one, you should be able to pull all because they are all coming from the same direction here in the Twin Cities. Ofcourse, being in the basement probably doesn't help; I've heard that others have had success with the silver sensor, perhaps at a non- subterranean level.
Then I learned that HD is free with basic Timewarner cable (DOH! ). So last night I tuned the cable (minus the box) and lo and behold, we have HD! So if your apartment has free basic cable (which mine did when I was renting in Bloomington), you probably will be able to pick up HD.