Does anyone know the answer for this question ?

I've been looking to buy some COAX extender cables with certain FAKRA connectors (GPS & GSM) to bring the connections that are terminated in the Boot to front console. Ebay naturally has some of the only cables I can find online.

What perplexes me is that Almost all of the cable listings I see have removed about 10CM of its outer black sheath and have exposed the outer shield of the COAX to the elements. Does anyone know why this is done? Is there some sort of grounding involved for these cables ?

Link 1 : https://www.ebay.com.au/itm/INSTALAC...frcectupt=true

Link 2 : https://www.ebay.com.au/itm/INSTALAC...4AAOSwJa5fCzW1

Thank you