This guy recently made a neat roll-up antenna for 2m using "faraday cloth"
He also makes flatpack helical antennas: https://www.ebay.co.uk/itm/196095158881
I think everyone from hollywood to big corporate companies have been buying his backyard inventions. He should feel really proud getting in there before the academics, youtubers, and opportunists jump on board! I bought this set back in 2019 and have had some really nice chats with the guy.
He made an SBand antenna out of a Beachball: https://dalybulge.blogspot.com/2023/09/diy-gatr-ball-antenna...
Before that a Fabric Parabolic Antenna: https://dalybulge.blogspot.com/2022/11/updates-on-portable-p...
Explaining how he did the design: https://dalybulge.blogspot.com/2022/10/parabola-design.html