I use the Radio Lab RV marinized.......
I use a Mac and the marinized WaveRV. that you listed. Running the NE and mid Atlanitc Coast I can usually 'hit' any non-encrypted open wireless modem from about 1-2 miles offshore. The growing problem is the surge of 'subscription for price' nodes in popular anchorages/ports (in which most formerly open modems, now seem to have all turned their encryption on). Usually near any high density population area someone is bound to not be encrypted. The marinized WaveRV is a good unit; but, do get the self-powered extension cable if you need more length than supplied with antenna .,... to get the antenna as HIGH as possible. ;-)