The HBU 22 is a good fit for the signal strengths in your area. (I am assuming you are just looking for Baltimore) As far as working in the attic.....it will likely work, but may require some experimentation with placement for reliable reception.
I bought an HBU-22 cause it easily fits in the car & find it a very good antenna for it's size. (Yes, I'm an antenna geek) I was very surprised that it actually picks up some Baltimore channels in the attic of my house. Channels 45 & 54 are 2 edge & 55 miles away.
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