I have an ARRIS mp2150 box and we have tried using the IR tether with limited success. It has a very narrow operating left and right angle of operation. It seems it less than 20% left and right of centre. You need to almost sit in front of the IR tether to operate the box which is out of sight. We sit about 10 to 12 feet away from the TV. Is there another IR tether with a wider angle of operation that you can recommend? I don't mind buying one.