Unfortunately, the PRO 42 does not have RFI immunity. However, I do not think you would experience any RFI issues because I have NEVER heard of any RFI issues regarding the PRO 42 (there are also no reported issues in our database).
If you decide to purchase and you for some reason are experiencing RF issues, there is a Shure product called the A15RF. For more information regarding that product, please contact Shure Inc.
For more information regarding the PRO 42, please visit www.audio-technica.com