[mjw930]

Part of it could be the other makers spent so much time playing down the value that it would look funny if they came out with it themselves. Combine that with the cost (the V1 uses 2 antennas and a custom mixer to differentiate the 2 signals) and it probably doesn't make financial sense for Beltronics to copy the design. Remember, there are really only 2 players in this field anymore, Valentine and Beltronics. K-40 is a specialy product and the others simply aren't in the same league.