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where the [] operator denotes 10*Log10 operation. The Total Power results for RXD in table2 correspond to Transmission and Reception with the COCO and Yagi Arrays; i.e., the radarcase. Replacing these results in (6) we obtain:2⎡⎛ε ⎞ ⎤C⎢⎜⎟ ⎥ = 11.1051−14.6+ 1.9 = −1.5949dB⎢ Y⎣⎝ε ⎠ ⎥⎦(7)For the independent Transmission and Reception experiments (RXC in Tables 2 and 3),we must consider the areas only one time in equation (5). The calculated efficiency ratios forthe transmission and reception experiments are -1.67 dB and -1.7743 dB respectively. Theseresults conform very well to the result in (7).Finally, as the insertion loss difference between the COCO and Yagi Arrays was 0.5 dBin favor of the COCO; the total efficiency ratio is -2.0949 dB.4. ConclusionsWe have calculated the total efficiency ratio between COCO and 3-element Yagi array,and found that the COCO antenna gain has to be corrected by an efficiency factor of ~2 dBover whatever is the efficiency of the Yagi array.Acknowledgments: The VHF radar at the Peruvian Antarctic Station “Machu-Picchu” is animportant part of the Peruvian research activities in Antarctica. We would like toacknowledge the support received from the Jicamarca Radio Observatory staff.ReferencesBalsley, B.B., R.F. Woodman, M. Sarango, R. Rodriguez, J. Urbina, E. Ragaini, J. Carey, M.Huaman, and A. Giraldez, On the lack of southern hemisphere polar mesospheresummer echoes, J. Geophys. Res., 100(D6), 11685-11693, 1995Woodman, R.F., B.B. Balsley, F. Aquino, L. Flores, E. Vasquez, M. Sarango, M. Huaman,and H. Soldi, First observations of polar mesosphere summer echoes in Antarctica, J.Geophys. Res., 104(A10), 22577-22590, 1999384