Many thanks to SWLing Post contributor, Ron, who writes:
If you like monitoring the VHF airband then this antenna might interest you.It is a half-wave dipole cut for the middle of the band. (Recall that half wave vertical dipoles do not need ground radials.)
It is very well built and pretty rugged but is not meant for outdoor use.
How well does it perform? That depends on several things…how far you are from your airport? What is the “lay of the land” where you live? Etc.
Does it work better than the supplied telescoping antenna that came with your scanner?
Yes indeed.
And you will also notice an improvement in comms from aircraft in flight, too.
I had hoped to hear the ATIS and VOR from my local airport but they are too far away (20 miles).
In addition, the eBay seller (and builder) is also very pleasant to deal with.