Throw it away.

Make a dipole for the longest frequency you desire to operate on.

Formula is 33 / 66

Make the one leg 33% of the length of the frequency and make the other side so that when combined to the first leg equals 66% of the total length for the dipole.

A true Dipole is a half wavelength at the center cut frequency.

I use the term dipole loosely - because it is a non terminated antenna that has two sides...

It will then be resonant somewhere on all frequencies above the center cut frequency as long as the Q of the coil is high.
Don't use a low Q coil balun...