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The absolute value of the background brightness temperature has been measured at a radiofrequency of 408 MHz. Observations were made with a large pyramidal "standard gain" horn aerial and the aerial temperatures were compared direct with the temperature observed with the receiver input connected to a matched resistive load of known temperature. For the region within 240 of the south celestial pole an average brightness temperature of 23 9K was obtained. Observations of northern regions indicate that values from previous determinations at northern latitudes are 4-5 degK too high.

A Measurement of the Sky Brightness Temperature at 408 MHz