Measurement device and method for estimating yield of a harvested crop

A measurement device comprising:

• a transmitter for providing a transmitted signal at a frequency;
• a transmitting antenna comprising a radiating element separated from a first ground plane by a first dielectric layer, the transmitter providing the transmitted signal to the transmitting antenna;
• a receiving antenna comprising a receiving element separated from a second ground plane by a second dielectric layer, the receiving antenna arranged to receive the transmitted signal;
• a receiver for receiving the transmitted signal from the receiving antenna;
• and
• an electronic data processor for measuring an observed parameter of the transmitted signal between the transmitting antenna and the receiving antenna to estimate a yield of a harvested crop for a row or section of crop within the swath of a harvesting machine, where the observed parameter comprises observed attenuation, phase or both.