IPhone interference with Cable receiver

So I'm trying to watch a tv show in HD (Cox Digital Cable in Northern Virginia) on my Explorer 8000HD. I've learned that whenever I click the check e-mail button on my 1st Gen iPhone, it causes the cable to cut out and all I get is a grey screen. I have to change to another channel and come back to the HD channel (Channel 727 - DSCHD) in order to resume the feed. I have been able to replicate this phenomenon on other HD channels but not to the degree of channel 727. On other channels I just get brief blockiness and loss of audio before it corrects itself.
Can anyone else replicate this?
Makes me wonder about what the phone is doing to my brain.

Its not the DVR or the TV (unless its a CRT). Its the cables that you have hooked up. Either the coaxial cable running from the wall to your DVR box is not shielded or the cable running from the DVR box to the TV is unshielded producing the signal interference. Same thing happens to my small TV in the bed room when I have my iPhone sitting on the dresser next to it. I've found that in that case it was the coaxial cable running from the wall. I have seen it mess with CRT TVs and it not be the cables. Its kind of strange though its messing with it from across the room, mine normally has to be pretty close to things to get interference.

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