As an "enhancement" to this suggestion, this is the Winegard HDA100. Look also at the HDA200, only a few bucks more. In addition to more gain (and :-( higher noise figure), it has an adjustable attenuator. I used the HDA200 with my AM21 and found that it was just as bad receiving signals that were too strong as those that were too weak. The amp had to be adjusted "just right" for me to pull in the stronger and weaker stations at the same time. I've posted before about the AM21 being a "weak" receiver, with it not picking up at all stations that were solid on two other receivers split off of the same antenna. With a Dish DVR now using the same connection that the AM21 formerly was, OTA reception is much more reliable, and the gain setting on the amp doesn't make a bit of difference except for changing the reading on the signal meter.