Well I don't know why that shouldn't work, but I just tried connecting the Chan 3/4 RF (coaxial) output of a Motorola HD-DTA100u that I have (»
Re: [Content] HD DTA ) to an old CRT TV, while it was also connected via its HDMI output to an LCD HDTV, and I can confirm that I could watch on both TVs at the same time (albeit in SD on the old CRT TV).