My current top 7 choices for portable antennas on Amazon. As an Amazon affiliate, I can earn commissions from qualifying items.

Teyleten Robot Portable No Tune End Fed Half Wave Antenna Module
https://amzn.to/3UZmbas
K6ARK QRP Antenna Matching Unit Kit
https://amzn.to/3EaCgUv
K6ARK 20W Antenna Matching Unit Kit
https://amzn.to/3yc9mzy
Radiowavz END FED Half Wave Antenna, 40M
https://amzn.to/3SQ45Wn
RadioWavz DX40 Off Center Fed (OCF) Dipole Antenna
https://amzn.to/3ru3oXg
WINDCAMP Gipsy 5-50MHz HF Horizontal Dipole Antenna
https://amzn.to/3rnK8dX
Shark Antennas S-F5MS 5-Pack (10, 15, 20, 40, 75M)
https://amzn.to/3e9IBVA