I use a powered multi-switch as Ti suggested above, that way you can have several receivers connected if you like, and each receiver can receive V or H at any time. The multi-switches I use are Zinwell SAM-4803. They have four (4) LNB ports to run two dual LNBFs if you like, wired up as follows:
-LNBF1 -13Vdc vertical
-18Vdc horizontal
-LNBF2 -22KHz on, 13Vdc vertical
-22KHz on, 18Vdc horizontal
These particular switches allow up to 8 receivers to be connected. (8 output ports). Each of the 8 receivers have access to each LNBF, vertical or horizontal, at any time. Advantage of this type of switch is that all the current to run the LNBFs are supplied by the switch and it's power supply, rather than loading the receiver(s). If you plan on having more than two receivers hooket up at any time, this is the easiest way to go IMHO.