The two STEREO radio receivers measure wave intensity, source direction and angular size in the frequency
range 40 kHz to 16 MHz, corresponding to heliocentric source distances of about 1 Rs to 1 AU. One 10-40 kHz
receiver measures radio and plasma waves near the 1 AU electron plasma frequency. One receiver makes high
time resolution measurements at 50 MHz. Time Domain Samplers make simultaneous wideband waveform measurements
on three electric components at 250,000 samples/second. Antenna systems include three mutually orthogonal 6-meter monopoles.