http://home.btconnect.com/g1lvn/eqso/coverage.htm

has links to coverage map software from VE2DBE and "G8GTZ how to get
started guide". The G8GTZ stuff is essentially because it's a bugger to
get the altitude date for the UK loaded in.

Takes a while to get it working, but once you have mastered it the
worlds your lobster. It's all freeware as well - works as well as lot
of commercial stuff which costs thousands of pounds
Regards
Gareth
www.g1lvn.org.uk