Try pin diodes. You need two of these plus chokes and some caps
to form a SPDT switch.
These are used in switching RX/TX in almost all tranceivers.
Putting a forward bias on the diode turns it on.

Reggie.

----------
> From: Randie Ohtsji [4555] <rohtsji@GLENVAN.GLENAYRE.COM>
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [OT] Solid State switch for antenna
> Date: Thursday, February 26, 1998 5:40 AM
>
> Hello,
>
> Sorry to bother this list, but I know this is the only place
> I can think of which has some RF gurus listening.  (I, on the
> other hand, am very weak with RF design)
>
> I'm trying to share one antenna between two receivers. Is there any
> way to use a  solid state switch which will only connect up one
> receiver at a time to the antenna?  At first I was just thinking
> of using a relay as the switch, but I am concerned about the
> reliability of the relay over time and would like to remove any
> mechanical components which could fail.
>
> I am going to use some RF modules in either the 433MHz or 900MHz range.
>
> The antenna switching will be controlled by a PIC!  :)
>
> -Randie
> rohtsji@glenayre.com