Wondering about my Windom!

Hi All,
I have a 66', 40m - 10m Windom with a 4:1 balun fed by 50ohm coax and would like
to pick your brains. What (short) addition can I use/make to get it to tune
effectively on 80m? (Or should I try something else altogether for
80m?) I have limited space due to overhead power lines going to various
properties which radiate out over my garden from a pole at one corner
of it. Finding room for anything much longer (especially on the 'long
side of the windom) is difficult without getting close to one or more
of these wretched power cables. All ideas gratefully received.
Cheers,
Jonathan.

The best way of getting a Windom to tune on 80 is by making it resonat there, so length is the answer.
It may be worth your while buying, or making a 9:1 un/un & tuning this against earth from the bottom on the garden using a inverted L set up, this will make 80 a much more pleasant band to work as the 9:1 will reduce QRN & by coax feeding it at the bottom of the garden the QRM will also be reduced.
I use a coax end fed using a 9:1 as my special events antenna & it works a treat, I even got Spain at 10.30am when using it as a vertical up the side of a Church tower, we also managed to bust a massive pile up, with our first call, into a Maderia JOTA station last year using just 100 watts & no decent earth to tune it against.

Cheers Daxi,

I'll give that best consideration. One of the guys at my club has suggested turning my 66' Windom into a 66' CAROLINA Windom which is also known as an 80 Special. To do that he reckons that if I put a choke after the first 10 feet of the coax coming from the 4:1 balun, and let the 10 foot length hang straight down then that length will radiate and give the desired result as long as I use a manual ATU which I do anyway! He reckons that it will be about 4db down on 80m which should make very little appreciable difference. Might try that first as it is a bit less drastic! What do you think?
Cheers,
Jonathan.

That's not a bad idea, but don't forget that 4dB is well over 50%.
Most antennas are compromises & all you will be doing is compromising a band you do not currently have so give it a go, you can always return to original if you not like it.
But I would still consider a 9:1 & a length of RG-58 coax, it's not an expensive option & it would give you a second multi band antenna.
Oh & I love Windoms, I often borrow a military windom from a friend for special events that allows you to match the antenna to the available space & the required bands & it's a great antenna.
A last thought....Just because someone else gets a good/ poor result from an antenna it does not mean that you will, our licence requires experimentation so if it appeals give it a go.