I have 2 e DTT receiver bought and built together with the Technisat DigiPal. If the antenna in front of the window (which goes directly towards the perhaps 15km distant television tower), then the receiver is virtually trouble-free. Is it something deeper and wider in the room, then there are numerous disorders. Given the low price, we are satisfied with the purchase. The antenna apparently works well with the aforementioned Reciever together (detection etc.).
