LMR-100 is good coax for short pigtails, but not long runs. LMR-100 is about 19dB/100ft or 0.19dB/ft.
The loss @ 2.4GHz for LMR-100 is 40dB/100ft.
Here is the spec sheet from Times Microwave:
http://www.timesmicrowave.com/telecom/pdf/LMRGuide.pdf
As Jeff stated, 0.5 dB loss per connector is the generally accepted guideline. Your 5' pigtail would have a loss of 3 dB. 5 feet is not _so_ bad for an LMR-100 cable, but go as short as you possibly can.
You did not say what your application was going to be. I think that's important. If you're going to do a permanent outdoor installation, don't use LMR-100 for the whole length; it's too delicate. Use a short length of LMR-100 and match it to a 4' lentgh of LMR-195. The LMR-195 has much lower loss and is much more durable.
On the other hand. If this is going to be a cable that you carry around for antenna/signal "testing", a single 5' length is better. Attaching any kind of heavier coax to the pigtail in a non-permanent setup runs the risk of stressing and damaging the tiny Orinoco connector.
Michael
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