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Saw this and had to comment so I’m bringing up an old post.
Your calculation is wrong….25,000 square feet is NOT a square mile.
If the broadcastvision can broadcast a radius of 200ft in a circle around it that covers 40,000 square feet!!. The certified BV transmitter is advertised as broadcasting to an area of 25,000 square feet or more. I have and use the more recent version of these and they are also IC certified and work very well.