This is a simple testbed designed to test N antennas with the Nano VNA.  I wanted a reliable way to get a known ground plane and stable platform with known cable distance and impedance, making the Antenna under testing the largest moving variable.

The center hole is ~15.8mm to accomodate the 5/8" N threaded diameter of the Female connector.

The legs are short but have a ~2.5mm hollow core for easy mounting on dowels, or to self-tap M2.5 risers (shown in the example images).

Suggestions and improvements welcome!