I'd definitely like to see some changes to the radar. You're idea is one I'd like to see at least tried, just to see what effect it would have in the main. There are obviously some potential problems with gameplay. Remember that the rules in the MA are primarily there for gameplay purposes, not for realism. Perhaps if a automated message went out over a country's channel when the first target on a base was destoyed, it would help to balance it? Something like, "Base A34 is under attack!" Afterall, right now if you hit nothing but ack at a base, there is no way to know it's actually been attacked without going there, which you can't do if you're in the air. Sure the dar might show you something is near or over the base, but that's all.
I'd really like to see terrain masking implemented, too, as well as a basic radar cross section model that would dictate the range at which a target would become visible (buffs showing up sooner that fighters, for example).
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Sabre (a.k.a. Rojo)