Thanks Nomadic, will definitely be fitting a UHF. Have the hand helds as back up. Update me for sure on when your going up.
Thanks to everyone for all the input so far, so much knowledge and experience here.
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Not sure if I've mentioned this previously - I'll blame oldtimers. But you can get an attachment that converts an iPhone 4 into a sat phone (and now for 5 as well). Then works off your existing provider plan etc - expensive calls I believe but if its for emergency contact only.