Cell Phone Reception Hawaiian Beaches?

[Bullwinkle]

"Up Canyon" we use these - I am able to hit a cell tower six miles away - well enough to get cell and internet in my very remote off grid location vacation cabin (mainland / verizon)

http://www.ebay.com/itm/Wilson-BD800AM-Vehicle-Cellphone-Signal-Booster-37-dB-Repeater-Amplifier-/111012204403?pt=PDA_Accessories&hash=item19d8d7cf73