Taoglas Barracuda OMB.8912.05F21
S11 plot:
Values at 868MHz:
(Apologies for the bad quality photos - the African sun isn’t for taking photos!)
Conclusion
This antenna is OK, but I have seen antennas that work better. Because this antenna resonates over a wide frequency range it will receive unwanted signals too, which will increase your noise floor. I doubt that the extra gain this antenna gives you will make up for the loss in SNR, because the unwanted signals also lie in the same reception area as your LoRa signals.