That's always a good antenna!  How long are the elements.
From what I read, a non-resonant feedline length is best.
81 feet is a good length.
I use a 80 meter double extended zepp here, fed with 450 ohm line through a 
4/1 balun in to either an external or internal tuner, depending on the band.
I keep thinking of changing to a new antenna, then I work everything I hear, 
and ask why?  Its been up for 20 years, and I don't have an answer yet.  I 
hairpin the ends back so that the 178 feet of elements fit in a 44/112 feet 
lot.
You can do the metric conversions.