480i Output
I can confirm that the VOOM receiver outputs a constant 480i signal via either of its two composite video output jacks.
One of my televisions is a 4x3 format Panasonic HDTV. I have one of my VOOM receivers feeding it with two separate inputs:
A. 3 cable component (1080i) video and L/R audio
B. Composite (480i) video and L/R audio
I use the B. output above when looking at standard definition 4x3 signals satellite such as CNN, HGTV, etc. While the VOOM receiver's component video output does not fill the screen on my Panasonic set, the composite video output gives a full screen non-distorted high quality picture, when combined with my Panasonic TV's scan doubler.
The 480i picture quality from the VOOM receiver is only a little degraded compared to the big dish/4DTV output that I had previously used on the same TV; so I am pretty happy about that. An experienced TV tech who re-converged my Panasonic set the other day said that he was extremely impressed by the colors and quality of the VOOM receiver's NTSC signal output. He said that the picture seemed significantly better than that provided by the other small dish companies.
The VOOM receiver is also quite sensitive at picking up off the air HDTV and standard definition digital signals, even in a multipath area. It is easily the equal to my LG LST-3510 OTA receiver and is much superior to my Samsung T-150 and RCA DTC-100 receivers.