Total posts : 45366
From everything I know, the Medium Wave Band, the AM band, operates by GROUND WAVE.
I have always understood this to be a radiated wave traveling across the ground, right at the top of the earth’s soil.
Other bands, like the FM band, do better with high antennas because they are more like light bulbs which can be seen better the higher they are.
I also know from experience, that medium (AM) waves flow around objects the same way as water. Another reason to keep them low down on the ground.
I think putting AM antennas up high should only be done when there is no other choice.