Aerial signal amplifier in a 2013 Topaz

I have recently acquired a 2013 VW Topaz Auto, with low mileage and in lovely condition.  Very pleased to have moved back to an automatic after four years with a Warwick Duo manual.
I have one problem.  The aerial signal amplifier appears to be defunct, and I have failed to locate it to effect a remedy 
Can anyone tell me where it is hidden ?
Keith 

Thank you Stewart. I'll investigate tomorrow morning.
I note that Frederic approves of that tip !
Keith

Thanks for the help Stewart. Found the amplifier as described. The problem has now changed to -  no12V to the amplifier (yes it is switched on!) and no 12V to the TV12v socket.  Any clues ?. Like where is the fuse.
Thanks
Keith

Assuming you have an EC155 PSU as the manual, fuse 7 on the PSU controls 12v socket and TV amplifier.

Yes though our 2008/9 Topaz only has the switch /fuse block set up thank goodness not the touch screens of the later models.
See my various posts on all things Topaz and others
frederic

Thanks Peter I will acquaint myself with fuse seven tomorrow, and report findings.

Thanks Peter, fuse seven was the culprit. I had visually checked all fuses earlier and found them all to be good. After your tip I checked number seven for continuity and found it lacking. I now have 12v to the TV and the aerial amplifier but no signal.  Ces't la vie.
Keith

Glad you're sorted. Don't forget to update your profile with your Topaz.