I contacted zigwire and they have recommended the AMU-2405G-SMA unit.
AMU-2405G-SMA---Zigwire
The secondary antenna services only one house so I can set up a single unit that can handle a large user load and use our existing Linksys to service the second antenna with a light user load.

A 13dBi antenna was suggested:
YG-2413---Zigwire
although i am not sure if this is much better than the dish we currently have.

zigwire has also recommended a specific network switch to connect everything through. NSH-561 Managed Switch NSH-561 Managed Access Switch---Zigwire
They are claiming a consumer unit (such as a 4 port Linksys) has to small of a processor and could get overloaded.

I will look into FCC and local regulations. Although I am relatively certain there is nothing.
Any suggestions on the equipment they've recommended?