The Terk loop appears much wider than it is. If you removed the screws and cover, you will find that the actual loop itself is about 1/3 the width of the form. 8 turna are connected to the tuning capacitor and a single coupling loop is connected to the 1/8"/3.5mm socket on the back. The coupling loop can be used to remotely couple to the AM band radio. in addition, i have used this coupling loop to an antenna wire and ground and inductively coupled the entire loop to a radio. i use the larger loop and capacitor to peak the reception. This makes it similar to the other loop antennas as the AN200. 

73,

kevin

kc6pob