I have 1-1/2" conduit for the cabling on one of my C-Band dishes. In that conduit are a ribbon cable with two coaxes motor cable and polarotor cable. Also a siamese twin coax and a single coax for the OTA antenna attached to the back of the dish mount. I used four coaxes for a Bullseye II ortho feed for a long time but using a C only ortho and a separate Ku dish now.
So there were seven cables in that conduit and it was as tight as you can get. I had to lube them to get them pulled through.
My other C-Band dish has a short run underground and I use a 2-1/2 ' corrugated plastic tubing, real flexible like a vacuum hose that I found in a surplus yard. There is a two coax, motor & polarotor ribbon and four single cables in that with a cat5 network cable as well.