No argument there. It would almost have to be a grant-funded experiment or a research project. But if it works it would certainly eliminate the real estate problems associated with a traditional AM facility. Then there's the whole concept of actual FCC approval - although they have shown willingness to accept some radical antenna designs:Also given the revenue/ad environment, I doubt most AM broadcasters have the capital to experiment on such a gamble.
WQVR(AM) Is Granted CP to Use HEBA Antenna at Night - Radio World
The FCC has granted an application for a CP filed by WQVR(AM) 940 in Webster, Mass., requesting licensed nighttime operation with its High-Efficiency Broadband Antenna.
But it would be a fun project.
Dave B.