Have a search on Orinoco on this BBS, I prefer this solution, as you dont need a bridge in the car. With the Orinoco solution, the bridge is in the house and just wireless card in the car. I did need to supply 5v to the card in the car though, and its not ideal leaving the empeg and 5v supply live in the car overnight.

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Rod, UK Mk2 64gig Red S/No.341
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Rod, UK