Abstract: A system to add metadata to downstream broadcasts to devices such as smart phones, MP3 music players, tablet computers, etc. equipped with receivers to receive said downstream broadcasts and a full time or part time upstream digital data communication path. The devices are controlled to display or playback advertisements, images etc. in the metadata, detect click events indicating interest by a user in something in the metadata and communicate that click event upstream over a full time or part time internet or an SMS data path connection. Upstream communications to implement user interest such as visit web pages, make a phone call, start an e-commerce transaction are implemented by the client devices. The Transmitters have structure to insert metadata in band or out of band with the broadcast program content and can be coupled to ad servers.