Even with a mast mounted amplified WiFi antenna you will only get WiFi out to about 2-3 miles and that is going to be 'spotty'.
Surprisingly, with a mast mounted amplified WiFi antenna along close to the 'surf line', internet signals are quite strong and regular and with few 'paid service' nodes and 'dead spots' - from Cape May all the way to Mt. Desert Island.
Delaware Bay - nada because of the extremely sparse population.
antenna example: Bitstorm Bad Boy Xtreme