> attic or other indoor reception of VHF channels is sometimes much
> more difficult than UHF, because UHF penetrates building materials
> more easily
This is incorrect. Building materials (and trees, etc.) attenuate
higher frequencies more than lower frequencies. UHF is higher frequency
than VHF. Some materials attenuate more than others.
It *might* be that UHF can get through a hole (like a window)
that a lower frequency signal (like VHF) can't. Compare the
width of a VHF-LO antenna with the width of a typical window.
Just a theory, I haven't tested it.
> I would get an antenna designed for both VHF & UHF
Seperate antennas work better than a combo.
Antennas with good reputations that are worth considering:
Weingard YA-1713 http://www.hdtvprimer.com/ANTENNAS/w1713.html
AntennasDirect DB8 http://www.hdtvprimer.com/ANTENNAS/DB8.html
AntennasDirect XG91 http://www.hdtvprimer.com/ANTENNAS/XG91.html
Channel Master 4228 http://www.hdtvprimer.com/ANTENNAS/cm4228.html
Weingard PR-8800 http://www.hdtvprimer.com/ANTENNAS/w8800.html
Some of these have changed names and/or designs. I think the PR-8800
is called something else now, and the 4228 was redesigned somewhat.
If you want to keep the new antenna in the attic, be sure and measure
the space available and make sure your chosen antenna will fit.