These two videos are from the same guy, one is a range test and the other is him constructing it.
102 SS Whip vs Homemade CB Radio Base Antenna
Range testing and comparison of a 102" SS whip antenna. and a Homemade antenna. Both have 2 Ground plane wires, the 102 has stainless ground plane, the homemade is all copper.
"I cut mine to 103.5 inches. used stiff #14 solid copper wire and expanding foam. started out with 104" for all wires, and trimmed all wires equally to tune it. I recommend using number 12 or 14 copper house wire, because it will stay straight in the pipe. ...."
He also mentioned he filled the PVC pipe with expanding foam. I think it's interesting but wonder why not just use a 8' copper pipe? Wouldn't that be more effective due to the wider diameter?
Some of the comments:
One guy said: "«Only 2 things | would do different 1) The PVC would fit over the mast pipe with 2 stainless bolts with washers & Lock nuts to hold it to eliminate clamps. 2) I would use smaller diameter sections of PVC stepping it down smaller with each section to the tip for better wind resistance.
To which he replied:
You think like I do, originally I was going to have it slip over the mast pipe, but My local hardware store did not have the pipe or fittings I needed to do it that way. the wind is not a problem here, even in Our worst storms this antenna barely moves. Thanks for the comment, and I'm glad | got You thinking. 73's from 151 SC.
This video details how he built it: