I'm failing to understand the explananation differentiating eletric field from electromagnetic field. Especially when you are talking about 60hz AC. RF frequencies are going to be practically nonexistant and well below the 50 volt threshold which the research claims "attracts" the ants.

I am very familiar with conventional motor control and in residential applications such as you are describing, they would be across-the-line contactors. It is possible a variable speed drive may produce RF frequencies but they are not typically used in residential applications because of cost.

Do the ants swarm radio towers or high tension lines?