pish posh. That's no radio transmitter or blocker. Anyone who know guitar knows that that is not a tie -- it is one of those guitar straps that curves up and around the guitar and hooks into the sound hole. Like the one Willie Nelson uses with "Trigger".

The alternating stripe thing is because the strap is made of that "sharkskin" type material that they used to make suits out of. Seen from different angles, it appears to take on a different color. It isn't the stripe that has changed, rather, it is merely the angle from which it is viewed.