A pigtail connector is a short cable, usually with different types of connector at each end. (In the case of a modem pigtail, converting between different types of antenna connector). It's probably worth getting a pre-made pigtail rather than trying to make your own, chances are the signal quality will be better.
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Second the others; I have no idea what you're asking about. Try describing what you're trying to do, or pointing us to some previous discussion which explains the idea.
Why would you want to peek at your modem's tail??
. Even after Googling "peak tail" (not any help unless you are mounting your modem on chromatography equipment or a sportsbike), that question still makes absolutely no sense to me. :(