Sorry, I was not thinking to the end as a lambda/w wire would have been around 7,5 cm!!
It sure is a nice amplifier.
I have bought a few PCBs of TELRAD amplifiers, from their Breeze Compact 3000 equipment, see #320.
They do not need any snowflaking and are good for 20W DATV. I am using it as driver, but friends are using them also for linear NB amplifiers. Efficiency is quite bad using the Idq from data sheets, so I will follow your hint and try reduced values.