Multiswitch to Combine 5 LNB with Off-Air?

Just run the Standard Zinwell 6x8 out , then the BBC, then a diplexor (with the antenna feed), then the cable run, then diplex out

If you have 4, or fewer, IRDs then you don't need a multiswitch. There are 4 outputs on the dish.

But you must diplex AFTER the BBC, as stated above.

So:

DISH...coax...BBC...coax...DIPLEXER...coax...DIPLEXER...coax...IRD

With the OTA antenna feeding into the first diplexer, and split back out of the second.

Note: This is not approved by D*. Diplex at your own risk (and pleasure!)

or.... you can use a SWM. it is not supported by directv, but it does work