Topband: Multiple Antennas/Single Preamp?

[Eric Rosenberg]

I am in the process of putting up 3 EWEs on my small city lot
to feed my single radio little pistol (flea flicker?) station.

Since I can only use one antenna at a time, it seems to me that
I could have the three antennas feed into a single bandpass filter
and preamp. 

The question is: what kind matrix switch or switches (3-in/2-out
for the antennas; 2-in/1-out to the preamp) do I use to switch
the filter in and out of line (I'll always be using the preamp).
 Is there a single switch I can use (or build...egads!) or do
I have to have multiple switches? 

Thanks in advance,

Eric W3DQ
Washington, DC