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Recent wideband data taken for the spectacular gamma-raya burst source GRB260310A have allowed a check of the antenna polarizations. All antennas were measured, except for ea20. </div>
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For the great majority, all is well: antenna polarizations less than 5% for Sband, and X through Q bands, and 10% for L and C. (C-band is notably worse than the others, on average). </div>
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Notable exceptions are:</div>
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S-band: ea17 at 8%. </div>
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C-band: ea5 is > 20% above 6.5 GHz, peaking at 7.2 GHz.</div>
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ea15 > 20% all frequencies</div>
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ea18 ~ 15% all frequencies</div>
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X-band: ea02 ~10% from 10 to 11.5 GHz. </div>
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Ku-band: ea03 > 10% from 16.5 to 17.5 GHz</div>
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ea07 > 20% near 14.4 GHz, >> 20% near 16.6 GHz, and 15% near 17.5 GHz. </div>
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ea14 > 10% from 16.8 to 17.8 GHz</div>
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NB: many antennas have poor polarizatino above 17.6 GHz, near the upper band edge.</div>
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K-band: ea21 ~ 10% all frequencies</div>
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ea22 has wild behavior, with > 8 resonances ~evenly spaced. </div>
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Ka-band: ea10 has wild behavior, with > 7 resonances each > 20% cross-pol. </div>
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ea26 has a single resonance (20%) near 32.1 GHz.</div>
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Q-band: ea12 is >>20% above 46 GHz. </div>
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