Total posts : 45366
Your base loaded antenna is essentially omni directional. If you want to shoot more signal in a particular direction, use as many radial wires at least 1/4 wavelength long from the base of the antenna toward that direction (fan them out in an arc, of course). I would recommend a 3 meter circular ground screen at the base, in addition.
About the only way you could make a directional array would be to use a passive reflector element. I don’t imagine that the efficiency would be very high, but you could look into it further. Maybe someone has tried it. I think it is impractical to directly drive two elements, due to the restrictions in the FCC rules on a “single 3M element”.
If there is a particular area that you want to cover, you might consider just adding a second transmitter at that location. Others have used that technique successfully.
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