What is the meaning of "broadcast" here? "Getting into the consumer's head involves thinking about our long-inculcated awareness of the broadcast and the private.The most important part of a message (the bit we notice first) is often not the content, but the intended audience". https://econsultancy.com/blog/67464-why-email-is-the-king-of-one-to-one-marketing
As far as I get, it is set against the noun "private" which is "private information". Google and the Free dictionary didn't help. http://www.thefreedictionary.com/broadcast