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I got the HDM68 RF modulator, and I'm really impressed. I connected my Roku to it and the RF side to my Predicta Siesta. It has the clearest picture I've seen on the Predicta - I can actually read the text from the Roku. Furthermore, this is the only adapter I've used that doesn't have any audio noise when there is text on the screen. As far as the audio goes, the level is just right - every other RF adapter I have used, apart from the Blonder-Tongue, has a very low audio level.
I like the controls too. There is a channel changer on the front, and you aren't limited to just channel 3 or 4. There are also controls for audio level, video level and output level. The output level is high enough to broadcast, though not as high as the Blonder-Tongue.
The only down side is that the output from the Roku is horizontally compressed - there is no option to stretch it or letter box it. In practice I didn't find that much of an issue.
I also connected up my DVD player (an old oppo DV-980H) and played some 4:3 programs that reproduced perfectly with no stretching. With 16:9 source material I could use the oppo setup menu to control if it was letter-boxed or squished.
There is a settings menu that primarily controls the audio carrier frequency, but there is also a setting called "A/V carrier rate" that can be either 12db or 16db. I've no idea what that means!
I see there is also a unit called the M69 which has regular A/V inputs.
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