This antenna has been designed primarily for VHF Air Band reception, and my tests showed it to perform well. I would be happy using this as a VHF Air only antenna, although I noted that it outperformed my reference antenna up to around 164 MHz.
I DO NOT recommend using this antenna for UHF Mil Air reception. Although it will receive strong local signals, it will miss a lot of transmissions because it is not designed for the UHF air band band.
You may also be interested in a previous video I made, testing the D1000 VHF air band portable antenna (see https://youtu.be/9VbO5eJdWf0).
Darren from Broadsword offers multiple Slim Jims for sale, and you can specify the frequency you want it to work best on. He also makes transmit capable 2m & 70cm versions.
You can view his selection of handmade antennas on his Facebook shop ( https://www.facebook.com/Broadsword-Antennas-944965925647729/) or eBay ( https://www.ebay.co.uk/sch/darrenshiels/m.html?item=274394408494&rt=nc&_trksid=p2047675.l2562)
The antenna was tested with RTL-SDR v3 dongles which US viewers can order from https://amzn.to/2NIGGGZ (SDR only) / https://amzn.to/2Zn9vhs (SDR + antenna kit) and worldwide viewers can get from https://www.rtl-sdr.com/buy-rtl-sdr-dvb-t-dongles/
Thanks for watching the Frugal Radio (FR) channel!