I make few articles in the past on my blogs about antennas for BCL, SWL and MW listeners.
Antenna is the most important for a listener, it is possible to make your antenna for a very cheap price.
You can also buy it.
Make a simple DX antenna for your Chinese portable radio
FREE in PDF The Ham Radio Handbook by W6PNF and many other books and magazines
Lot of links to make antennas, its is PDF and FREE
Loop shortwave antennas for SWL not to much expensive (made in CHINA)
LOOP antenna for MW and SW listeners
Is a loop antenna for a SWL the best solution?
A nice bar-antenna for MW from Japan
Antennas for listening to the medium wave
I hope you can find a lot of information about antennas for listeners on these links.
Good DX and 73 de Frank SWL F14368
Big antenna for MW on a pirate radio station