Mini-Loop VHF Antenna for RDF

This is a mini-loop VHF antenna for my RDF handheld system.
The loop has a diameter of 190mm. You will find more information about the mini-loop on my blog:
http://diebastelkammer.wordpress.com/2014/11/14/rdf-mini-loop-fur-vhf-upgrade/
http://diebastelkammer.wordpress.com/2014/11/12/rdf-mini-loop-fur-vhf/
Information about the RDF handheld you will find here:
http://diebastelkammer.wordpress.com/2014/10/25/rdf-handheld-direction-finding-antenna-nun-mit-iphone-gps-kompass/
STL-Data f