As you are out in the wide open anything from a leaky microwave over to a cordless 2.4 GHz phone can knock out the link.
If you need to get a more stable link you should look at other than wifi links.
I am trying to connect wifi to three buildings for a dvr setup. I am using a linksys dual band wireless n router, A engenius 5610 Access point-bridge which is hard wired to the router, my pcs are using realtek 11n usb(hiro 802.11 bgn wireless adapter model #H50194) I get full signal with internet in both buildings.My problem is about every 5-15 minutes both will disconnect for no reason. How do i fix this, or what can cause this?