I used to record my HD locals from Comcast with a MyHD tuner card. It supported clear QAM and I remember two of the big 4 networks were subchannels of the same main channel. It meant I could record two channels at once, which was pretty cool. What dish seems to be doing (or trying to do) with PrimeTime Anytime seems to be a cool idea. "Can the HR34 record multiple channels from the same transponder with a single tuner?" would be a better question. The dish Hopper, since it is only a 3 tuner box, needs a little help and PTAT is just that. The HR34 can record all 5 networks if necessary, without any extra magic. I haven't had a chance to compare HD quality, but it may be that dish's HD quality is such that recording sizes are smaller, meaning less data for the four channels combined, which would make it easier to capture the data with a single tuner.