Now that the snow is finally melting around here, I'm looking into making a 10 meter vertical antenna that can be easily hung from a tree and held vertical by the weight of the feedline. I'm thinking of making a spreader at the bottom of the radials out of plastic pipe to keep the radials, feedline and choke in place. KK4OBI has an excellent article here: https://www.qsl.net/kk4obi/Elevated Radials.html where he models a vertical antenna with radials at 20 degrees from vertical, it has an impedance of 50 ohms with a vertical/radial ratio of 0.522 and a resonant length that is 93.3% of a dipole. That's very close to what I had in mind, but not quite a low enough angle on the radials to make it easy to hang from the top. I'm thinking that an angle of 3 to 5 degrees would be a good mechanical design. Too bad (for me) that he didn't model the radiation pattern as the angle of the radials was stepped from (say) 90 degrees down to 0 degrees, and at the same time, the ratio of vertical/radial length for a 50 ohm feedline impedance at those angles. Going to the limit of zero degrees on the radial angle, the "vertical bazooka" design uses 1/4 wave of feedline coax wrapped back over the feedline with a choke at the bottom of the foldback part. Of note, the 2 meter AEA Isopole design is similar to what I want to build, but has too many levels of radials for a practical 10 meter antenna in my location. So, to the root of the question, is there any advantage of having the radials fan out at the bottom vs the straight bazooka vertical design, and what happens to the vertical/radial ratio for 50 ohms as the angle goes to zero? I'm thinking of making a test antenna that I can connect my MFJ459 analyzer to, trimming the vertical element for a 50 ohm match, then scaling the final results for the 10 meter band.