Following my review of the Broadsword D1000 portable antenna, I tested out a VHF Slim Jim. I discovered that on some frequencies it worked better than my homemade airband antenna, which had been providing good reception across the VHF & UHF spectrum.
The main takeaway was that this antenna performed well at the design frequency, but not as well outside of it.
Would I recommend this particular antenna? If you are wanting just to monitor VHF airband, then this Slim Jim will probably work well for you. Performance drops at the band edges, but as a single band antenna, it pulled the signals in stronger than my reference antenna.
I do not recommend this antenna for use on other bands.
I now have it mounted outdoors, and it is constantly connected to a radio in my shack.