Drape a wire around a bookcase and attach both ends to an MFJ 935B small high-efficiency Loop Tuner™ and they instantly turn into a small, high-efficiency, multi-band transmitting loop antenna! MFJ 935B tuners include an RF current meter for maximizing the power being delivered to the loop antenna. You can operate 5.3 to 29.7 MHz with a full 150 watts. No ground, radials, or counterpoises are needed. A 13 ft. wire formed into a loop operates 30-20 meters, 4 ft. for 17-10 meters, 7 ft. for 20-15 meters, and 28 ft. for 60 meters. You can tune any shape of loop--a circle, square, rectangle, or any odd shape--however, a quarter-wavelength wire shaped as a circle is the most efficient. A fixed wire length covers about a 1.5 to 1 frequency range (i.e., 28-18 or 10-7 MHz, etc.). Exact frequency coverage depends on the wire length, loop shape, and environment. The excellent performance of a small high-efficiency loop antenna is well known and well proven by users all over the world. You'll radiate a low-angle DX signal that literally rivals full size dipoles and works incredible DX! They are also a very quiet receiving antenna. They respond to magnetic fields, and not electric fields, so you'll hardly notice static crashes during a storm. Their high-Q rejects out-of-band interference and reduces overloading and harmonics. MFJ 935B tuners are perfect for apartments, hotel/motel rooms, antenna-restricted areas, and portable locations! You can take one with you and have it up and operating in minutes from nearly anywhere when camping, on vacation, DXpeditons, or even from a motor home. All you need is a transmitter/transceiver with a wattmeter and a wire loop to be operating in no time. An easy-carry handle permits easy handling to and from portable locations. The MFJ-935B High-Efficiency Loop Tuners™ also have a detachable mount for a PVC cross.