Yep ... electric fences can give really annoying interference ... we live about 5km from our exchange and the local farmers have fences that run parallel to the phone lines for a mile at a time (and probably use some of the poles for mounting 🙂) ... back when we used the BT line for internet, not only would we get loud rhythmic clicking on our phone conversations but the spikes were strong enough to crash the internet conection ... made it un-useable hence our switch to 4g for the web.

K