there is a company called ubiquiti they make wireless access point that can range up to 15 k you could but 2 of the loco m5 nano station and run one as a ap and the other as a station

now the hard part is they need Poe power I have read some have them running off solar I am still trying to figure out how to get this to work cause cause I have a place that is perfect from a house to the end of the field for a live camera