When pulling together equipment for fox hunting, a good directional antenna was required. Eddie (W4JEM) uses a 2m 3 element yagi made from sections of a flexible steel tape measure. I had an opportunity to use his antenna, and thought it would be perfect for Boy Scout activities - durable and easily repaired.
I found some very good plans on the internet, thanks to WB2HOL. WB2HOL Yagi Plans
I constructed the pipe body from 3/4” sch 40 PVC, and used these dimensions from WB2HOL's plans. My only additions were to add a piece of pipe behind the reflector element to use as a handle, and to route the coax through the pipe.
Here is a front view of the finished antenna.
This is a back side view.
Here is a close up of the hairpin match. I used a 5” length of #14 solid wire for the hairpin.
Note that the coax and hairpin wire ends were soldered into a pair of lug eyes, which are then clamped to the driven elements. I removed the paint from the ends of the driven element with a wire wheel, and then tinned the exposed metal. This prevents rust, and provides a more solid contact surface on which to clamp the lugs.
Also note the coax routing.
This final view shows the elements folded up and ready for travel. You can stick the folded ends into the open ends of the cross fittings. Very convenient.