One of the problems with AM radio is that the wavelengths are so long. That means the antenna has to be long, or a big tuned one.
A straight antenna and a good ground to the radio is best. However the antenna to be 1/4 wavelength needs to be around 130 meters long.
I can remember the time before FM radio came to the UK.
I had one of these.
I was given that AM LEAK tuner after this arrived in the home.
That was an HMV FM tuner, the first one available in the UK.
Anyhow I drove a substantial ground rod and ran a wire antenna over the drive way from a window to the trees.
I could get AM stations from the SE of the UK to continental Europe, especially the Dutch stations, which was the point of the exercise.
You can make equivalent box antennas.
Quite honestly though, I have never listened to AM since I got my first FM tuner. I'm totally amazed that AM transmitters and radios still exist. They are a total waste of space and energy.