This guy has been making fabric antennas for a few years and selling them cheap on ebay: https://www.ebay.co.uk/itm/204232411345

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.