Weak Signal in NYC

I installed the DTV converter box and also have a weak signal. I tried 4 different antennas and its all the same. I have come to the conclusion that the signal needs to be increased from the towers. I line in N.Y.C. and actually saw a news broadcast about this problem. It said that the tall buildings are blocking the signal. Funny how analog signal worked just fine. Wake up people everyone doesn’t live in N.Y.C. and we all have this problem. Do you think it is a ploy for all to subscribe to cable !!!!!!!!!!!!!!!!!!!