As Beavis & Butthead would say: It doesn't just suck .... it REALLY sucks ...the reception sucks
Install is fairly simple. These electronic boxes come with 3 loose wires plus the antenna signal cable. The latter plugs into the cable that goes from the original antenna to the radio. The 3 wires connect to ground (the blank one), to the positive(switched) end of the defroster wires (long black wire), and to +12V (red one, a switched line from the radio is also available at the original antenna - green wire as to be seen on picture).The link you posted is no longer available. Can you provide the details to how you did this.