[time-nuts] GPS antenna in attic?

[Peter Gottlieb]

I'm beginning to set up in my new house and planning where all my various 
antennas are going to go.  Being a wood frame building, I was wondering if it 
was sufficient to simply mount my Thunderbolt GPS antenna high in the attic.  It 
would be convenient as there is already a high quality CATV line running from 
there to my lab area that I'm not going to use and the Thunderbolt antenna 
system is 75 ohms.  Will I have much attenuation going through an asphalt 
shingle roof?  What if it is wet?  Or has some snow on it?  Another advantage 
for me would be I could mount that antenna on the opposite end of the house from 
where I will have VHF and UHF transmitter antennas.

Peter