What are the conditions for the base invasion to happen?

What are the conditions which must be met before the aliens invade your base? Can it happen again?

When I got raided by the aliens, this was my current story progress:

Date: July 8th. Difficulty: Normal. Alien Storyline: I raided the alien base some weeks ago and researched the hyperwave beacon, but I hadn’t start building the hyperwave relay yet. Exalt Storyline: Two missions ago I completed the third covert ops extraction mission.

Answer

As far as I know, the invasion triggers 14-21 days after you assault the alien base. I can confirm you do not have to build or research the hyperwave beacon, as it triggered before I did.

Attribution
Source : Link , Question Author : Philipp , Answer Author : legacy

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