Hi Scout! Thanks for supporting of our devices!
Hope the following answer can solve your problems.
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Surf SOHO MK3 is 3x3 MIMO Router with using the multiple transmit and receive antennas for multiplying the capacity which means the three Antenna send and receive with the same bands to achieve the higher data rate.
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The output power setting is drop 3dB step by step from the MAX power level.
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The Antenna usage is the same as the 5dBi 5.5GHz / 2.5dBi 2.4GHz Indoor Dual-Band Omni Antenna found in the store, radiation pattern and orientation can reference to the spec.
Thanks,
Steven