A remote pilot is operating a small UAS with a 2.4 GHz control link near a residential building containing multiple Wi-Fi networks and appliances. During execution of emergency procedures, the control link experiences degradation. What is the MOST significant frequency spectrum limitation contributing to this scenario?

A remote pilot is conducting a Part 107 small unmanned aircraft operation using a primary command and control link in the 2.4 GHz spectrum. During the flight, unreliable control is experienced due to radio frequency interference. The small unmanned aircraft system has a backup command and control link in the 433 MHz spectrum, but the remote pilot does not hold an FCC amateur radio license. What is the correct action?

Which of the following frequency spectrums has the associated limitation of requiring an FCC amateur radio license for use in small UAS control link operations?