Two farmers with no telephone service and a small river between their farms used this stretched wire device.
Two oil cans with hole drilled in bottom center of both cans big enough to let wire through. Knot end of wire to keep inside cans and stretch wire tight with can holders ( gripping sides of can not at bottom) at both ends. Shown in drawing mounted to side of house by window so you could raise window sill and lean outside of house to talk into or listen to open end of can. Or mounted on secure table able to hold can with wire tight. Nothing should contact wire between can connections.
To attract neighbor's attention to talk, ring bell or cow bell in your can's end.
Range can reach up to 300 yards. I suggest a radio played into one can at your speaking level and fine tune tension at other end for best sound level and transmission.
