>There are ways to extend your wireless overage for like 20km if you want - works great if you live near the beach, work from home, and want to work from home from the beach lol.
>https://www.dlink.com/en/products/dap-3712-20-km-long-range-80211ac-wireless-bridge

Via POE, nice setup. OTOH if your lot is huge enough to put main house > 15 Km
from beach or island house, money for install should not be a problem....