What's this on the GPS antenna lead?

Bruce Coates
 

Hi

I'm building a tracker using a Ublox Neo 6m module from eBay (of course).  My module has an adhesive "thing" on the feedline about half way down. This "thing" is fine metal mesh and is connected to the shield of the feedline.  It seems to be common on the tiny ceramic antennas on eBay but many also don't have it. 

Any ideas?

Thanks

Bruce - VE5BNC

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