If you want to try to figure out what’s going on for yourself, all you need is a pair of tape measures and a software defined radio (SDR), as [Tom Farnell] demonstrates. Tape measure antennas ...

The index card serves as a sturdy extension of your measuring tape, sitting in the corner of whatever is being measured. It creates a clear, flat surface that makes measuring corners a breeze ...

A CNC router is used to carve the body of the new tape measure out of a solid block of wood and cut a top plate out of clear acrylic. [Ariel] then used an angle grinder to cut off a small section ...