Here's some diagrams courtesy of Ken0042.It says it's for the 9200 but it's the same set up as the 9242. You're going to have to do some rewiring and maybe buying some cable [use R6 not 59] to set up your new 9242. The SW44 switch is included with your new PVR. Don't move your dish, it should be fine. I'd go with option #3 here although I used #4 for a while but than I couldn't use any other receivers.
Here's the link
http://www.digitalhome.ca/forum/showthread.php?t=26721
actually I use Example #5 as being on the Wet Coast, two larger dishes gives me better reception.
You'll have to figure out where you want to mount your Sw44 switch as it has to be plugged in and get co-ax cable at appropriate lengths. Try and get cables with compressed fittings as these are best.