[ntp:questions] Good GPS for attic?

[Jonathan Sturges]

Hi,
I'm looking to use a GPS receiver as an inexpensive reference clock for 
an xntpd time server.  I'd like to leave the GPS in my attic for 
convenience and asthetics.
A while back I bought a Radio Shack DigiTraveller GPS for this purpose. 
  It's ideal on almost all counts except that it can't keep a consistent 
lock from my attic.  It's close though (maybe if I could mount it above 
the insulation that would help).

Can anyone recommend another inexpensive GPS that might be more 
sensitive?  I don't want fancy, just plain-jane with a serial port that 
can spit out NMEA strings for xntpd.  PPS would also be nice, but I'd be 
happy without it too.  (I'm mostly doing this to have a time reference 
for household computers, and also just the experience of setting this 
up.  Fantastic precision would be nice but certainly not required for 
this particular project.)

thanks,
Jonathan