Thanks for the links, I am familiar with yagi design & it’s difficulties. Have been in attendance of DL6WU and his successor DK7ZB who has improved on his design.
And yes, I’m quite aware of the possibilities of yagi’s . Scale this to 1090MHz for maximum range. However, for ADS-B it would be impractical to duplicate.
I am mainly looking for real-world results. I have some crazy idea which would require a directional antenna, lightweight, some gain but a very high F/B ratio. I live in an area with many, many planes all around and I feel l miss many as a result of false decodes/collisions.
I want to set up an SDRPlay receiver with a high F/B directional antenna but it should not have to narrow of a beamwidth. That is why the corner reflector came to mind and the Bulgarian alternative seems attractive. But I can barely find any real-world experiences to determine if it’s worth making any effort.
My primary feed is a Bulgarian coco @ 9m with an FA Blue stick. The second is a standard whip + RTL stick (China) @ 3m (side of the house), the third is an SDRplay RSP2 (overkill for this purpose) with a 5/8 Kathrein for 144MHz @ 4m (other side of the house).
The interesting thing is that the RSP2 gets a very high message rate compared to the other feeds. I may move it to the location of feed 2 for comparison.
But I believe that a rotating directional antenna such as a corner reflector might bring many more planes. Continuously rotating an antenna seems possible and seems worth investigating (longer term project though). But first the “right” antenna.
So still looking for real world observations about the various antennae compared to a vertical even though I’m not sure some objective comparison can be made.