Did you lose the colony to a new city, or a cultural expansion of an existing one? The idea (to me at least) is to have the resource until you can found a city near it, or extend a city's cultural boundary to include it. The worker is freed once this happens.
Or did you lose the colony by military force? The can be defended.
You only get the effect of 1 radar tower at a time, though if you build more than 1, then you get the effect until all near you are destroyed, of course.
You'll want fighters if you have high level games that go to the IA - the AI loves bombers...
I stand corrected, I think. Like I said I build colonies if the resource won't be within reach of a city soon, and it's been a while. (If the resource is ridiculously far away, I just tough it out.)
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