Bilal has been making the Isotron series of antennas for a long time. If they are taking a break from production, for whatever reason, then I have a suggestion.
A very similar radiator can be made using a broom handle, a porcelain lamp socket, and a 100 watt incandescent bulb. I will not look as futuristic as an Isotron, but will perform about the same. You may use a tuner if you wish, but no balun is required.