I built this antenna when the 50Mhz band first became available to UK amateurs. It proved to be a winner, but beware it is a big antenna and needs to be constructed like a battleship or it will not survive the high winds. Mine managed to live through a hurricane of 105mph, next door house lost his roof.
To give some idea of it's performance, I worked all continents and perhaps the very best was to KG6 on the Island of Guam, in the Pacific, this was with 3 watts cw, I received a 559 report.
Give it a try, the 50Mhz will soon be bursting into life on the new sunspot cycle.