Question about TP-Link Deco X20

This is a standard SMA connector like this: Delock LTE antenna with SMA connector (mobile phone antenna)

Do I need special LTE antennas for outdoor use with this router? Do I need to pay special attention to anything? Is there an antenna with 2 SMA connectors?

Hi, please remember that the device require 2 antennas to work with the external attached ones. I'm using it with 2 antennas and the reliability is awesome but it was also awesome without the external antennas :-)