Many programs are originally broadcast in the 16:9 format, but Mutichoice in all its wisdom decides to letterbox it and add the channel logo's outside the letterbox. Many LCD's and Plasmas allow you to modify the aspect ratio manually so it fits nicely in 16:9, but that stretches the picture, resulting in pixelated/crappie images, and cuts of the I-Plate 3/4 of the way.
I don't see the need for using a 90CM+ size dish in Gauteng. You are in the middle of the IS7/10 footprint anyway. With all the rain an crap we've had here the past 2 weeks, I've only had picture breakup on HD on Friday afternoon when the clouds where particularly heavy.