Hello,I don't know the problem has been solved or not but I am designing a folded dipole(53MHz) with a balun..well,as we know its load is 280-300ohm(in my design,it's 300ohm).So,I went for designing a 4:1 coax current balun,which converts 75ohm to 300ohm,but I was unable to design it.
Then I switched for sleeve dipole balun(actually, it's more of a RF-choke than to be a Balun) and it's worked...if anyone interested then let me know,I can discuss about my design.