New old stock parts, type MC26M-4 made by Magnum Microwave, originally rated for 3.7-4.2 GHz w/ 70 MHz IF.  I made a simple fixture w/a piece of FR-4, 3 SMA connectors & hand cut the Microstrip (.1 wide on .062-close enough).  I swept these & found they work fine (5-7 dB conv. loss) from 2-4 GHz (cover 2304, 2401 & 3456 Ham bands) with a 144 MHz IF & +7dBm L.O. level.  These are "pin" type for PC mounting.  You get data sheet & copies of my test plots, fixture not included.  

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