Long Distance free Wi-Fi 25km + Email opt-in

(Up to 25 KILOMETER range!

I live in Safaga Egypt, i Sorry for my bad englis
I have this idee for a longtime, to make advertising, email optin, on a free wifi 25km distanc,
let me explane, everybody wants free internet 30 min free internet for your email,
i hope you understand my idee, what do you think of it