A microwave heating element includes a microwave antenna configured to absorb power from a microwave field in a microwave oven, a housing having a first end coupled to the microwave antenna and a second end configured to be inserted into an item to be heated, and a transmission line positioned within the housing, the transmission line having an end coupled to the microwave antenna. The transmission line is configured to spatially distribute the power absorbed from the microwave field into the item to be heated at a location between the first end and the second end of the housing.