Matching Impedance for Bowtie Antenna 250 Mhz

I have design 'n simulate bowtie antenna with center frequency 250 MHz. The electric field waveform is ok. But the return loss is so big in center frequency ( about -8 dB). Do anyone know how to match it with 50 ohm coax, so i can get -10 dB return loss in center frequency ?

Thx b4

Dear,


could u give me your email address?

hi
pls attach u simulation an which software u used for it?