I know the dipole is the holy grail to many, but depending on your goal a vertical can outperform a dipole given certain parameters. The vertical generally provides lower angle radiation compared to the dipole and could be a better DX antenna.
My other current 40m antenna is a 20/40 trapped dipole. Those traps add some loss and at an overall height of 20 feet (my telescoping pole’s max height) there is a lot of ground loss and very little low angle radiation.
Then when you figure that I can use 10ft of RG-8X instead of 25ft of RG-174 for the feed, you are getting more RF to the antenna.
Yesterday I was very pleased with the performance of my build of the tri-band vertical. I had plenty of great contacts on all three bands, including 2 S2S on 40m using 10W CW. And this is with
- The swr on 20 around 2:1 and around 3:1 on 30 and 40 due to my haste in getting on the air.
- I was still using 25ft of RG-174 because I haven’t dug out the RG-8X feeder from the basement.
- Still using the bare minimum 4 10’ radials laid on the ground.
With 4, 8, or 12 more radials, a shorter and less lossy feed, and care given to tuning 20m more accurately I’m sure the antenna would be killer.
My point is assuming the linked dipole would outperform the vertical is not a given. Unless the dipole is a half wave above ground, which could be as much as 70ft, the vertical is likely comparable especially for dx contacts.
Add to that the fact that at least on 20m, the antenna is easily made directive with gain by adding another 20ft fishing pole and some wire for a passive reflector design.