Antennas made of a straight bit of wire of about 1/4 the wavelength usually work well. Think FM radios: freq about 100 MHz -> lambda = c/freq = 300 cm -> antenn

Antennas made of a straight bit of wire of about 1/4 the wavelength usually work well. Think FM radios: freq about 100 MHz -> lambda = c/freq = 300 cm -> antenna of 75 cm (30 in).