I start from the SI5351 CLK2 signal, which is a (more or less) square wave with an amplitude around 3 Vpp.

At the moment I've built a 0.5 - 1 W amplifier (1-30 MHz 0.5-1 Watt class C amplifier) which works pretty well, but I'd like to reach 5 Watts at least.

For this reason I'd like to replicate this schematic  

that I found here 20w-broadband-hf-1-55mhz-power-amplifier.

I modified only the voltage control part, using 2 bjt's instead of 2 MOSFET's because I have no P channel MOSFET.