Picked mine up from its wheel refurb earlier and despite being parked overnight in an industrial building (basically in a Faraday cage) complete with a Bentley Continental parked right over it on a hoist(!) it managed to keep signal. I will be parking it up after the weekend as per usual so if it is still showing the antenna symbol next Friday when I get the car out I can be 100% certain it has picked up a signal at some point while garaged.
I'm pretty confident it's working exactly as intended 
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
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