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Dr Bruce Thomas of the CSIRO Radiophysics Division designed the feed horns for the receivers.The horn for the off-axis receiver had a smooth circular cross-section with a flared tapered aperture, and a corrugation surrounding the aperture of the horn. The main receiver horn was the first experimental test bed corrugated horn which was used to verify the operation of a two hybrid-mode horn. This innovative CSIRO-designed feed horn increased the sensitivity and bandwidth of the receivers. It was originally designed to operate at 2700 MHz, which was a routine operating frequency in those days. Bruce was able to change the tapered section to operate at the lower frequency of 2282.5 MHz. The corrugated section remained unchanged.