I have gotten 500 feet working before with Legacy LNB’s on RG6
The key to making it work is the switch commands getting to the switch.
I remember we had to run separate cables for 119/110 and then placed the sw21 within 50 feet of the receiver, or in one situation right behind the receiver.
Dish pro LNB’s will even work longer distances as there is no 13/18 volt switching, rather a constant 20 volts.
I really wish Directv would have gone to a stacked type setup when using external switches such as a SWM 16. The fact they combine the 99/101 and 110/103/119 really bothers me.
With Dish you could always use separate dishes for separate satellites to address line of site issues. With Directv if you can’t get everything on a slimline your pretty much out of luck.
I have had Directv installs where we could not get 99 and 103 on the same dish. This particular one was in downtown Manhattan by the former World Trade Center site