This lora 915mhz antenna can be used for esp32 oled lora board, https://www.amazon.com/dp/B07HJ49VN8
Connector type: ipex
Band definition: 915MHz, pls check picture
Standing wave ratio: < = 1.5 ; Gain: 2dBi ;Maximum power: 10W ;Input impedance: 50Ω
If you have any problem in 915 mhz lora antenna, please contact Nextion to solve it better.