To be honest, I have never been a big fan of attic mounted antennas. I have always thought that if you are going to spend money on an antenna, you should put it where it will do the most good, which is on the roof.

But according to Ernie Bornn-Gilman's theory of signal transmision, which states, "If you still have good signal, well then you still have good signal." attic mounting, while not being ideal, might be ok provided you can comply with the Bornn-Gilman conditions. I would do everything else I could to make sure I had good signal if I were going to shove a good antenna into an attic.