Building a Simple J-Pole from 3/4" EMT Conduit
Yes you can make a J-Pole out of almost anything that;s made of metal. Here is a J-Pole made out
of 3/4" conduit pipe and a dual gang electrical junction box. PVC legs were added to give it some stability.
An SO239 jack was screwed to one pipe and a piece of copper wire was soldered to the center output of the SO239 and
then connected to the other pip with a sheet metal screw. Dave's J-Pole Antenna Calculator was used
to get all the lengths and measurements. It shows an SWR of 2.0 (not perfect but reasonable) and it
tested well at about 15 miles. Here is the full parts list:
- 3/4" EMT Conduit cut to 57 1/2"
- 3/4" EMT Conduit cut to 19"
- Dual gang electrical junction box
- Two 3/4" Conduit Set Screw Connectors
- SO239 Female Connector
- 6" Unshielded Copper Wire
- Two Sheet Metal Screw
Optional Pieces for Legs:
- Four 16" pieces of 1/2" PVC
- Four 1/2" PVC 90 Degree Elbows
- Four 1/2" PVC Threaded Couplings
- Four 1/2" Electrical Coupling Nuts