Lathem ATX-GPS - Manual (Page 2)

Installing the ATX-GPS
Locate the antenna at the highest elevation possible, with a wide view of
unobstructed, open sky. If possible, avoid mounting the antenna on the North
side of a building, which might block exposure to satellites.
Proper locations for antenna mounting:
Improper
locations for antenna mounting:
Avoiding mounting the ATX-GPS in windows, between buildings, at “inside”
corners or under awnings.