"This DIY AM antenna is best used outdoors but you can make it work inside by somehow re-routing the wires. It amplifies all weak AM signals, so a powerful local station might be heard over your entire AM radio dial."
Source CCRANE.com
Look also this video
I make few articles on my blogs about antennas for listeners
LOOP antenna for MW and SW listeners
Loop shortwave antennas for SWL not to much expensive (made in CHINA)
https://chinaradiosswl.blogspot.com/2023/06/loop-shortwave-antennas-for-swl-not-to.html
Is a loop antenna for a SWL the best solution?
A nice bar-antenna for MW from Japan
Make a simple DX antenna for your Chinese portable radio ( SW )
Good links for antennas SWL, medium and shortwave