My third motorised aerial has packed up in less than 18 months. the original was an alfa one, but probably not the original as it had been removed repalced before looking at the fixings, the second was a maplin unit, no longer available, the third a moderate priced stainless steel off ebay which looked a quality unit.
Fed up with replacing these I have substituted a Halfords amplified window aerial on the rear screen tucked right down into the recess at the base of the rearscreen. Threading cables thru the stoplight box is easy and then I trimmed 1/2" cutout from the fabric panel to fit over the small box of the aerial.
Of course this will only work for aero fitted GTV as there is no stoplight in the rear screen.
Reception is excellent, even in known weak signal spots in my area.