I forgot about the tail idea. Should be very easy to do.
Homer I worked with my Moxon models today, and again I find this antenna very troublesome if the dimensions are not very close to correct. The variations in wire diameters and using insulated wire or not...being among the most confusing to resolve...if this mix is not right.
Because the tuning is typically made at the outer ends of this antenna, where the tip length and spacing is adjusted...I don't see this antenna as being easy to re-tune, unless you are working at or near ground level.
The modeling of this one is equally not easy to make changes either, unless the tip length change is small and one just forgets about the resulting change in the (C) space between the wire ends. I did try some changes in wire ends without adjusting the spacing and found, within reason, the space may not be as critical as other dimensions on this design.
Homer, I modified a model without a mast that I had...using the dimensions you posted. It does not show good rejection or match, but the gain and angle are pretty similar as compared to other 2 element Moxons I have. However I had to change your wire diameter to 1.00" inch to get the match looking good, and I'm sure you didn't use that large of wires even if you used aluminum tubing.
Did you have to re-tune your Moxon made with this calculator after your original construction using the dimensions you posted?
The dimensions tba02 posted look about the same except the rejection is much better. Tba02 did not indicate a wire diameter he used, so I set the wire diameter to .50" inch and that showed a good match. If his dimensions were as posted, then maybe he built his Moxon using .50" aluminum tubing. Just a guess base on my model.
I asked tba02 earlier what wire diameter he used for the dimensions he posted, but he has not replied.
I want to model a 2 element Moxon that Henry makes, but I'm waiting on an update on his dimensions first. I will go over all of these models later and if they look good...I'll post them.
Homer, can you remind us a little about your success and issues with your Moxon?