

I can’t answer all your questions, but I can assure you that you probably don’t have a suffiently large enough power service connection at your house to blast out a powerful enough signal to do much damage.
If you did use all available power at your address, it would take almost no time to locate the person blasting out a massive “it’s me!” signal over the radio waves. Much like if you used all the power at your address to blast out an incredibly loud sonar signal, people will notice pretty quickly. Also, the massive antenna or radar dish/dome (much like the massive speakers) would give you away visually.
It usually means that 300 people were involved in the project at different stages of its lifetime. It probably also includes the people involved in sourcing the material, tools, people, workspace, etc. That’s probably 20 people who likely never touched the final product. There likely was also some marketing and business people involved. They did probably put hands on the final product for a photo op.