This is a popular hypothesis, but how exactly do you think it may work? It's not like you can see a "blank spot" by looking from radio sources, you'd need to put your antennas in a position where the plain will intersect your line of sight to the transmitter. And not just one, but massive number of lines if you plan to track it and deliver a missile there.

It sounds pretty improbable and I believe it's just an urban myth.