I have a Tibo TI 420 DAB/FM Tuner with a Philex 27741 Indoor DAB Aerial. In order to ensure I have access to new DAB channels I recently pressed the auto tune channel. Very frustratingly, Instead of adding additional channels I Instead I actually lost a number of existing DAB channels inc the mainstream BBC Radio 2 & BBC Radio 5 live. Conscious of a potentially poor internal signal, with the aid of an extension lead I took the tuner unit outside into the middle of the garden & pressed auto tune. However same result. I wonder if anyone could advise why I have suddenly encountered this problem and also how can I fix ? Do I need to get a new/different aerial ?