FM Backscatter (image) University of Washington Share Print E-Mail Caption UW engineers used FM radio signals to broadcast music and data notifications from a Simply Three band poster at a Seattle bus stop to a smartphone. An antenna made of copper tape was embedded on the back of the poster. Credit University of Washington Usage Restrictions with credit Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.