Many 868MHz antennas from Aliexpress are not really designed for 868MHz but sold as such.
Therefore I would like to share two antennas with you, which are designed for 868MHz.
‘Big’ 868MHz antenna from Aliexpress
VSWR 1.19 at 868MHz, tested with N1201SA.
Small 868MHz antenna from Aliexpress
VSWR 1.20 at 868MHz, tested with N1201SA.