j-pole antenna

Apologies if this has been covered, but I could not find anything related. I own Uniden SDS100, SDS200 and SR30C as well as a Baofeng BF-F8HP Pro. Recently, I installed a J-pole antenna 7-feet from the house, which stands 10.5 feet high. Grounded properly to my knowledge. Coax runs through...

Has anyone bought this ~ https://www.jpole-antenna.com/shop/aviation-airband-118-128-mhz-j-pole-antenna/ I was thinking about buying one. But before I do, I want everyone's opinion on it. How big of an improvement is it over the standard scanner antennas that come with the scanners...