Antenna Tripod with EMT legs

This is  a simple, portable, tripod for use with a vertical amateur radio antenna in a field setting. The leg angles are adjustable.  The legs are pieces of ½" EMT (aka 0.5" conduit).  (Actual OD for the material I used was ~ 18mm)  Leg length is up to the user.   The base has a center hole to receive a 3/8-24 threaded antenna base.  There is also a provision on the underside for installing an SO-239 Female UHF fitting, with passthrough for the center conductor.

Tripod components are assembled with 20mm M4 cap head screws and nuts.  The SO-239 is installed with M3 cap head screws.  The “leg tube” component has a depression sized for an M4 nut.  The “leg mount” component has a round depression sized for the cap of an M4 cap head screw.   Leg angle can be chosen as desired and locked into place with the M4 hardware.

Attachment of the leg mount to the base is done with two M4 cap head screws for each mount.  The leg mount screw holes are 25mm center to center.  Leg assemblies could be used in other applications.

Use a 10mm (3/8) crimped ring terminal to attach a wire from the SO-239 center conductor to the  3/8-24 antenna base.  Use small ring terminals under the SO-239 attachment screws to make ground connections.

For longevity, you might want to add a 3/8-24 extension for attachment of the antenna. This eliminates wear from repeated install/remove cycles on plastic threads.   One of the cheapest sources I have found for such an extension has been this:

https://www.amazon.com/gp/product/B08W56Y1WQ

Fusion 360 source and .STEP files are included.