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I had an Astrobeam myself in the past and it served me very well...with the matching coax provided. Very good antenna...rejection right in the rear, instead of in the side like yagis antenna.
I putted about 600-700 watts in it with no problems.
The specs tell about the class:
Latest Technology MOSFET’s in an Old School Circuit
The RFX150 uses a matched pair of ERF7530 high power MOSFET RF
transistors running Class AB.
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