With this method, you only need 1 or 2 kills to spawn fighter with ARH in GRB. You can even rush cap if you are using F-4F ICE.
Just loiter around the marking zone to avoid getting marked, and use TWS to scan for target. Enemy will always have an disadvantage since they don’t have access to markers. Even if they do, they still have to work with radar to find you, thus you can almost always fire first.
Since research point algorithm favors time spent alive instead of skills and GRB is often very long, so after you get 3 kills in fighter, you will have ~90% activity percentage to max out your reward.
Even if enemy does not spawn planes afterwards its still totally fine, since the longer time you spent alive, more reward you get.
I have luck getting 5000RP in non-prem without prem account in single game by camping air spawn.
This is way faster than dying every 3 minutes in ARB with 1 or 2 kills that only gives you 2000RP.
Also this strategy is great especially if you hate people flying CAS in GRB, it is a great reliefer.