Hi Paul,
With just the standard supplied little mag-mount, (mounted on a redundant Peugeot brake disc!) albeit on top cliffs (200', 65m) at Mullion Cove, I was regularly getting up to 350NM (A/C at FL 400) distance. and if I can get my wife's redundant lap-top working, I'll be keeping that on 24/7/365 feeding to the network. CGJon