Antenna amplifier 300W

Hello.

I need to design transmitter antenna amplifier with output power 300W on 50 ohm load. Input is taken from DAC with output amplitude 3.3 Vp-p.

Freqency range in 150-160 MHz.

Main problem is that amplifier must be as small as posible.

Anyone have ideas? May be there is ready to use modules?

Thanks in advice.

http://www.macom.com/Datasheets/MRF151G.pdf

Yes, I've seen this MOSFET but "Efficiency ? 50%". Is there any other solutions?

Amplifier must be with passive heatsink.

i would doubt you can do 300w power out at 150mhz with passive cooling. Which class of amp you need? maybe D class would be ok for efficiency.

D class is nice but requires smoothing filter. I can't imagine such filter at 300W. It is real?