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3

That is Sucoform 141 or a clone. A semi-rigid coax with PTFE insulation, 71% velocity factor. It's useable up to 33 GHz, though the SMA connectors won't go so high. Loss is about the same as RG-58. Power handling is pretty high.


3

BNC work well, make a positive connection, and are simple to crimp. I would suggest that you purchase a pigtail rather than manufacturing one because the SMA connectors are a beast to crimp. As far as the cables themselves, provided they are still in good shape, both RG-58 used by 10Base2 and RG-8 used by 10Base5 are 50 ohm impedance coax, which is exactly ...


4

BNC is fine. SMA is probably more common in this application, but BNC is widely available, and easier to swap around than SMA. Since this is receive-only and the pigtail will be short, coax loss isn't a real concern either — you probably want to choose something fairly thin and flexible to minimize the stress on the fragile MCX connector.


3

I'd go for drilling the hole and having a shorter cable. Go for the thicker cable (RG223 I think). This is a permanent installation, it pays to go the extra mile on this one. Make absolutely sure you have a ground where the antenna enters the house that is also connected to the utility ground via a low-impedance path. If I can recommend a website for good ...


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