It needs to be pointed
– Last Updated: Jun-09-11 3:32 AM EST –
at the general direction of satellite, but not precisely at satellite. It's not as sensitive to aiming as a sat TV dish. Also, IIRC from reading the Isat manual, you only need to point it there until it locks on the satellite, which may take 40-50 seconds. After that, you don't have to point it in specific direction, but you do need an open area over your head or at least to be near window for the duration of call.
PS: if this is of any help, here is one Isatphone review (no, I'm not working for them):
Satellite is located over the equator at 98W at 22,000 miles elevation. You can calculate the elevation angle (i.e. where to point it relatively to horizon) based on these numbers. There are calculation applications for TV satellites, so must be something for phone satellites too. for This guy reported from the US/Can border, which is way down South from where you are. His location was on the East coast at 45N 68W. Direct TV couldn't get signal there, but Isat phone could. 98W meridian is roughly in Winnipeg. So, if you are straight North of Winnipeg, point the antenna to the Southern sky. People straight North of Winnipeg, i.e. at 98W meridian, will get better signal at 55N parallel than those far to the East or West on the same 55N parallel. If you're on the East coast - point it to the South West, and if you're to the West of Winnipeg - point it to South East. "Vaguely in the direction of the bird", he says. There are more comments below the article, but almost nobody tells their location.