Well, it's all pretty much academic now since DirecTV has now reverted to the standard center-cutting of WITI-6's HD down-rezzed signal. But nevertheless for the record at the time this phenomenon was occurring, for WITI to merely feed a separate letterbox SD version of their programming to DirecTV as you suggest, for use on their Ku band SD locals system for the Milwaukee Wisconsin DMA subscribers, still would not have answered the issue. A 16:9 picture letterboxed into a 4:3 frame would be treated as a 4:3 signal by the receiver and appear naturally as a window-box image on a 16:9 (HDTV) set with mattes on all four sides. Or a letterbox image on a 4:3 TV with matte bars on the top and bottom. So I'm still theorizing that it was an actual 16:9 SD signal coming from 101 at the time to completely fill the screen with an undistorted image on an HDTV connected to the R22 on the 16:9 menu setting. However, while I realize I am somewhat going out on a limb on my assumption that a SD only receiver is probably capable of performing center-cut on a 16:9 signal with the appropriate flag settings in the satellite stream, until someone else can know for sure that this is not possible for an SD receiver, I'm sticking with it.