A number of "secret radio aerials" described via lifelike drawings in a 3x4 grid. From the top left: Using a flagpole Using a rain gutter Using house wiring Using a gas pipe disconnected from the meter Using an old rotary clothesline, with cable buried Putting one inside a chimney vertically Wrapping wires around a tree and painting them Using telephone lines Using the metal grill of an old elevator Putting one inside the hull of a ship Putting a "spiral aerial" on a wall and concealing it as part of the wall