Hi - I did reply to a dated thread a week or two ago about this exact issue but it didn't get any traction on it, but since then I'm looking at possibly going down a different route due to lack of parts.

I have a Focus 2008 with SatNav/Navigation, I've had an issue with the aerial base for years but never being bothered about it as I was at least getting some radio reception.

It's being getting sketchier though, and the GPS functionality has failed now as my clock has reset to the year 2000 and won't pickup a GPS signal.

I looked online about the simplicity of replacing the aerial base on the Focus Mk2's and it did look very simple - I ordered a basic aerial base only to find on fitting that actually this is significantly different compared to a non-Navigation model.

There is a sort of receiver that screws through into the aerial base, but the screw doesn't look to be long enough - but the design of the aerial base is different too obviously.

Reading a history on the navigation base, it's clear that this part is virtually unavailable to easily replace now even through auction sites, and I've not had much luck with scrapyards yet.

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Given the difficulty, I wonder if there is a (cheap) way for a basic aerial to connect to the radio now? I understand I can buy a fakra connector for the GPS aspect, but radio functionality will be needed.

I can probably connect the fakra GPS, but routing of wires specially in the headlining might be tricky for me... I was hoping my Haynes manual would direct me to it, but it said to not bother and get a specialist to sort the aerial. Tsk.

the clock is normal - GPS will remain functioning OK - but time and date went wrong after many cheap badly designed satellites all rolled over their clocks in April 2019 under a known WNRO event - all because to make for simple robust software, they had a 19 year clock (as most fell out of the sky before their 15th birthday no one though there was a risk).

Its quite simple for the manu to issue a time update to the car to make it realise the satellites are now sending out info saying something like its year 4, not year 24 - most owners only find out when the car's battery gets disconnected and it wakes up needing to find the date and gets muddled - sadly most manu never bothered in including tomtom, ford honda toyota mercedes etc.

as for the antenna - you could replace it with a different part - a GPS antenna is a GPS antenna - only the plugs and wiring lengths would change

this ones angle is a bit upright...

https://connects2.com/Product/ProductItem/CT27UV56