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A99 is not a bad antenna.

I have had an A99 on a 50' tower and an I2K on another 50' tower.


A to B comparisons to various stations resulted in no difference between the two antennas on TX or RX.


 I prefer the I2K as it seems to be more broad banded than the A99.

I can use the I2K on 10 through 15 meters no antenna coupler required.


I think my star duster is a better antenna than both the I2K and the A99 as the SD is much more quiet on receive.