I strongly advise against attempting to cook popcorn using a HAM radio antenna or any form of electromagnetic radiation device. This kind of experimentation can be extremely dangerous and is not an appropriate or safe use of radio equipment.
HAM radio antennas and linear amplifiers are designed for communication purposes and operate within specific frequency ranges. They are not intended or suitable for heating or cooking food items such as popcorn.
Furthermore, exposing food items to excessive radiation or inappropriate sources of electromagnetic energy can cause damage to the equipment, create fire hazards, and pose health risks. It is important to prioritize safety and use radio equipment responsibly and within the intended purpose.
If you want to cook popcorn, it is recommended to use appropriate kitchen appliances such as a microwave oven, stovetop, or specialized popcorn poppers designed for that purpose. Always follow the manufacturer's instructions and ensure you are using the equipment safely.