Hi Sangeeth,
Welcome to the Community Forum.
The Emlid LoRa antennas can only work with other LoRa antennas as we use a specific protocol. You can read more about the LoRa configuration on Reach devices here.
If you’re going to work with a third-party UHF radio, you will need to meet some requirements from the radio: it will need to work with 410-470 MHz frequency, work with TRIMTALK450S protocol, and send corrections in RTCM3 format. The RS3 can only work as a rover. Using a Reach cable, you can also connect the 3rd party radio through the external bottom connector. We offer the UHF antenna on our website.
We’ve collected some tips on how to work with a UHF radio with your Reach RS3. Please go through this support tip to learn more.