Ladderline is the way to go.
The best ladderline is made out of copper stranded wire about AWG13.
Problem with ladderline rain, snow and the balanced tuner you will need.
Nah, you do not necessarily need a balanced tuner. And Rain or snow ain't no problem with Real Open Wire Feeders.
My first antenna in 1960 was a 40 mtr dipole fed with flat used TV 300 ohm feedline. I did not know what a antenna tuner was. I was only 14 yrs old and even if I knew about tuners I could not afford one. I had an Eico 720 xmitter and it had a So-239 coax input. So I soldered a PL-259 on that TV line an plugged her into the Eico.
Well I worked WAS and gosh knows how much DX with that antenna. After about a year older, experienced hams started telling me, no way would my antenna work. I just smiled and kept working DX on 40 and 15 mtrs.
Since that time I have always had at least one ladderline fed antenna. Sometimes I bought ladderline and a few times I made my own, spacers and all. They all worked great. Of course I use a tuner now, and it ain't a balanced tuner. It is a TenTec 238B with a balun input. Works just fine. About 7 or 8 years ago I discovered a commercial Open Wire Feedline that is better than any ladderline i have used. I have been using it ever since, Rain and snow does not bother it and I just love the way it looks. Check it out. This is the GUD stuff.http://www.trueladderline.com/
That open ladder line looks a lot like slick-wire fencing to me. Hey! That gives me an idea :-)