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   introduction
If you search on the web this dual band loop feed for 23 and 13 cm. you can see the quality and efficiency of the product.
The project can be found for example at the link     http://www.ik3ghy.it/PDF/Loop_Feed_DUBUS_Version.pdf

   construction steps
The dual band loop feed was built by George  IZ1KLR (email   [email protected] ).
Below the construction steps of the object   ... (foto by IZ1KLR).
 

   dual band loop feed return loss
Measured by IZ1EVF Piero on the loop for 23 cm    

Measured by IZ1EVF Piero on the loop for 13 cm