This reply is a work in progress as I'll be building a simple BCB receiving loop over the next few days.
Here's an idea of what I have in mind...http://www.carcanada.net/dx/donloop.html
and a resource page for more ideas:http://www.mindspring.com/~brucec/amloop.htm
Back in the days when radios glowed in the dark, it wasn't uncommon to find a 'spiderweb' loop in the base of a console radio mounted on a pivot so it could be rotated appropriately. They worked extremely well and would pull in some very healthy DX during the winter months but (like every other antenna) tended to be noise limited during the spring and summer. On the lower bands it's usually not a lack of signal that limits your RX range, it's the noise level, and a tuned loop is generally your best bet for a favorable S/N ratio.
As an aside, about five years ago I picked up an AM/FM stereo receiver that came with a small loop for the AM side that I thought was a joke... Four turns of #22 stranded wire on a 6" square frame. Talk about being wrong... The reception is absolutely amazing. A few weeks ago there was a program on KFAB in Omaha that I wanted to listen to and my favorite 'big wire' was full of co-channel interference that night. The little loop on the stereo beat the pants off the larger antenna despite being many dB down in signal strength as it was able to null out everything I didn't want to hear... I have hopes the larger loop I'm building will be several orders of magnitude mo'better, and if the first attempt works out well I have a spot reserved for an outdoor version with a rotator and remote tuning. I have this bad habit of staying up late when Coast to Coast AM has an interesting guest and some nights I need all the help I can get...