For my 24 GHz dish I needed a feedhorn. The VE4MA superfeed proved to be almost perfect for the job. I made 2 of them and they looked to be OK in the measurements. The measurements are done bu Jack PE1KXH. See the following pictures:
The dimension and ideas come from the excellent website of Paul W1GHZ. Thank you Paul. You can download the dimensions. Drawing made by Bas our son in law.
For those interested there are 2 horns available from the production of 5, contact me if you are interested.