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I use a crappy antenna and I get a few meters, without any amplification. If it was going further I would use attenuators or a cage.

I have the SDR streaming satellite data for 5min and it then restarts and retransmitts again. That allows units on the assembly table to get a sat lock and pass the factory test.

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Does it see the SDR as one satellite, or multiple? I guess you can just spoof as many satellites as you want, but wouldn't it be rather hard to spoof a position?

Not the OP, but it'd see it as multiple SVs. Basically you figure out what the range would be from the SVs to whatever location you want the things to think they're at, and put out all the signals to make that happen. Spoofing a single SV is pretty useless, you have to spoof at least enough of them to give you a position solution.

Do you need to slave the clock to anything?

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