What do I have to do to install a dish 345 ft from my house plus another 60 ft run in the house to tv?
I would say a combination of RG11 Cable, and seperate dish pro dual LNB's and put the switch as close to the house as possible should do the the trick.
The key here is not the signal dropping, but the diseq commands getting from the receiver back through 400 feet of cable to the switch.
With 1/2" RG-11 you will need other fittings and a coupling that reduces the center conductor to the stiff single wire found in 1/4" RG-6 (or RG-59.) The RG-11 center conductor is tinned, stranded and stiff. It may be available with foam dielectric to reduce high-frequency loss but then with an even bigger core. (This from memory of 40 years ago.)
Just be sure it is 75 ohm and not an imitation.
-Ken
RG11 F connectors come with a center conductor that fits standard barrel and grounding block connectors. It's not a big deal to use RG11 - - particularly on the outside run to the grounding block. PPC, Snap N Seal, plus others make these type of F connectors. BTW, where can one buy imitation RG11?