Reddit reviews Sonline 3.5mm Retractable FM Radio Antenna for Mobile Cell Phone
We found 2 Reddit comments about Sonline 3.5mm Retractable FM Radio Antenna for Mobile Cell Phone. Here are the top ones, ranked by their Reddit score.
Brand new and high qualityOffer more signal for mobile phone
If someone is interested by the "actual antenna" part, this is the first result I got on Google: https://www.amazon.com/SODIAL-3-5mm-Retractable-Antenna-Mobile/dp/B00LHKUFK2
Probably gives significantly better reception than normal headphones.
You could just use a retractable plug-in FM antenna instead of headphones.
eBay
Amazon