Old analogue television sets have an antenna on top which picks up signals from the broadcast transmitter. If the received signal is weak, a TV signal amplifier can be used to strengthen the signal before it is passed on to the television set.
The job of an amplifier is to strengthen a signal. This is as true of antenna amplifiers as it is of guitar amplifiers. The means of amplification varies between applications, but the function is consistent. A homemade TV signal amplifier increases the surface area of the receiver. More signal is received and sent to the television set, which typically results in improved signal strength.
You can make your own TV signal amplifier with materials from around the house. You will need to purchase a balun transformer and antenna wire, but the wood and antenna prongs necessary can be salvaged. Straightened coat hangers make excellent antenna prongs. The antenna wire is connected to the screws and the balun, which carries the signal along the board.
Bend several coat hangers so they are V shaped. Mark out six holes, equally spaced apart on the timber, to mount the screws. Partially screw them in and solder the hangers onto the top of the screws. Run an antenna wire across the board, zigzagging between the bolts. Strip both ends, coil one around the first screw and connect the other end to the balun transformer.