900Mhz Base Station and Mobile

I am looking for a suggestion on a 900MHz radio pair.

One for a base station and one for a mobile unit.

The base station will have a Linux or Windows PC and the mobile unit will be running an ESP32 of some variety. Both the base station and the mobile unit will have antennas that track each other.

Distance between them will be up to 1Km with mostly clear line of sight.

I have never worked with the 900Mhz radios before and I am looking for some suggestions on what the best pairing would be for that utilization.

Best regards,
Masoric