The yagi should have about 8 dBi gain in the direction it is pointing. The center of the boom doesn’t have any elements, ... Take a 10 foot PVC pipe and run the coax through it and out the end.

And I have a 2,4GHz yagi which is laser cut out of a single piece of stainless steel sheet. ... that used PVC pipe. The RF design is not new, but the design of the “hardware”.