75 Mhz?

quote from IFI:

Notice to BattleBots„ Competitors: The use of these modems for the purpose of BattleBots„ is restricted unless used with the Isaac32 or Isacc16 Control System by IFI Robotics. This agreement between BattleBots and IFI Robotics restricts the use of the 902-905 MHz, and 925-928 MHz portion of the ISM Band to the IFI Robotics systems exclusively.