I have For Sale, Sinclair Bandpass cavities. 12" tall by 6" diameter.
Adjustable loops for selectivity. Very well constructed. Tested on IFR from
400-512 Mhz.
Can tune to your frequency.
$75.00 each. plus shipping
Mike N6KYD

picture at: http://www.docsradioden.com/canmain.jpg