Nice, how did you match it up to the coax and what type of coax?
I made one almost like that but used a 300 ohm to 75 ohm baulen coil (used for TV antennas) to match it up to the coax.
On that type of antenna it's dual element, that means both side are active, if you connect it to an unbalanced coax (RG-6 or RG-8 type, center conductor and shield) you loose one half of the antenna, thus the baulen coil is used to transition to the coax.
Did you do this?