While we're at it there's also   no such thing as a  specific  "HD" antenna that your normal yagi  wouldn't do for you   but hey.. that's not going to stop people re badging those either

» Why HD movie downloads are a big lie | George Ou | ZDNet.com

This is precisely why HD Movie downloads are a big fat lie being pitched to consumers because even the delivery of 1.3 mbps unicast traffic will bring most parts of the Internet down to its knees if enough people use the service. The carriers are in a strategic position to be close enough to the customer that they can actually deliver true HD-quality IPTV with some level of video on demand and that scares the Googles of the world to death because there’s no way an Internet based 1.3 mbps make-believe HD video service can compete with true HD IPTV

It may work in other countries but the US will likely  regulate it to death.