Every beam and tower (guy wires are ok) create great variable to make it fun but there is resonance at the end of your effort.Just cut and trim.
I'm certainly not the first on this antenna but I do add a rather stunning modification. The antenna can be loaded at the bottom end. in that case radials are added and it really becomes a slanted 1/4 wave vertical , W9INN made that suggestion in his instructions. The instructions are no longer shown on line. He is an SK.
My thought was-- what if I put radials at the base of the tower to cut ground loss. It was amazing. My 160 meter signal was much better. I worked 7 new countries in Europe in one night with 350 watts on cw (that is my maximum output with my little AL 84 Ameritron linear because my big SB220 doesn't go there) .
I only have 12 100 foot radials out now and I bend them around the house and every which way. But get this!! My signal was better off my tribander!! ( Hygain explorer 14) . Have studies been done on this?. Look I have been a ham 53 year. I have 342 countries confirmed and 1750 Challenge band countries. I'm not making this up. When I radialized the tower with ground radials, I definitely enhanced my signal on 20,15 and 10. There is no doubt about it. Yes, it is not demonstrable, it is anecdotal. . I have a friend ,NM5Y, who has noticed improvement when he radialized his 160 meterL offset from his 90 foot tower with his Steppir beam up there. . This needs field testing which I will not do but I pass it on for further testing. and thinking. Something is happening which I speculate is LESS GROUND LOSS of the radiated signal.But the half sloper vastly improved!!
Any way , back to the half sloper. Here is a quote from from a reflector with his Hams experience with the 160 meter half sloper.
"I run a 68 foot half sloper (1/8 wave length on 160 meters) mounted on my 40 foot tower, and really have a blast on 160 with it. You can see my antenna in the March 1998 issue of QST. Here are a few different lengths for your sloper, and a few different coil locations. Efficiency is not as good with the coil at the feedpoint, but I found it very convenient to place it there for my situation. I calculated the values below using 14 gauge wire as your sloping wire. The formula I use is right out of the ARRL antenna handbook (Limited Space Section). The handbook also has a chart that yields similar values. I calculated the antenna for 1.8MHZ. You can just shorten the end of the sloper to make it resonate up higher in the band. For coil at feed point : Coil Coil Half sloper length XL (ohms) L (uH) 80 feet 376 33.25 70 feet 484 42.80 For coil at mid point : Coil Coil Half sloper length XL (ohms) L (uH) 80 feet 731 64.6 70 feet 927 82.0 Let me know what kind of coil form you want to use (diameter, gauge wire, etc.), and I can give you some different winding combinations for the coil. I had no problems getting my 160 meter half sloper to resonate, but the half sloper is dependent on many factors such as ground, top loading on the tower, etc, so be patient. I am sure Tom (W8JI) and many of the other big guns on 160 meters laugh when they see such designs for antennas. Nevertheless 160 meters sure is a fun band and I recommend putting up anything that will get you on the Top Band. 73's Don Kirk (WD8DSB)
Don,s opinions and experience are very close to my own.
You can build your own loading coil,
There are numerous articles and internet articles on the subject.
This is not rocket science. Good Luck!!