How can fundamental overload of a non-amateur radio or TV receiver by an amateur signal be reduced or eliminated?

Blocking the amateur signal with a filter at the antenna input of the affected receiver is an effective way to reduce or eliminate fundamental overload. This method involves using a bandpass or notch filter tailored to allow only the desired frequencies to pass through while attenuating unwanted signals that may cause interference. By placing the filter at the antenna input, you can prevent overload conditions that occur when strong signals from amateur transmissions interfere with the operation of a non-amateur radio or TV receiver.

Using a filter on the amateur transmitter or switching transmission modes may not directly address the issue of overload experienced by the receiving equipment. While modifications on the transmitter can improve its performance or reduce its interference emissions, they don't tackle the overload problem at the receiver's end. Ultimately, installing a filter at the receiver is the most direct and effective solution to protect against unwanted overload from amateur signals.