Been a long while since i delved into radio but i recall a radio operators license can get you up a 1w at 2 4ghz which i think is technically reserved for metropolitan area.
1km wifi extender. This is a look at the signal king wireless signal booster and range extender. I think most wifi routers can go up to 30mw. The top countries of supplier is china from which the percentage of 1km wifi extender supply is 100 respectively. You can also choose from wi fi 802 11b wi fi 802 11ac and wi fi 802 11g 2km wifi range as well as from 1 1 x10 100mbps and 1 x10 100 1000mbps 2km wifi range and whether 2km wifi range is soho enterprise or home.
While wi fi networks offer improved versatility and flexibility over traditional ethernet cable based networks the effective range of many wireless routers is not large enough for many bigger homes and offices. 1km would require some serious power. It is possible to extend the range of a wireless network to one kilometer and beyond with the use of additional networking hardware. Which is why something with a 1km range omni directional would be beyond consumer means.