When transmission went digital, I went out and bought from Radio Shack, a plug in 10DB amplifier. Without the amplifier, in my driveway. I got 5 channels at best. I put the amplifier in and I recieved (I have not checked for a while, there may be more now) 19 channels.
The amplifier is about 35 dollars. You don't need to buy adapters, change your antenna out put some crazy apparatus up instead of what you have.
Just checked price went up about 2 bucks.
http://www.radioshack.com/product/index.jsp?productId=3780245