use a infinitv 4 tuner with Windows Media Center -lrb- Windows 7 -rrb- . before add the bda-s1 booster : signal level -26 dbmv snr 26 db after add booster : signal level -6.9 dbmv snr 30.4 db we have intermittent freezing & block on some channel ; those problem disappear when we add the booster . I recommend this for anyone who have low\/marginal signal level and snr .