The co-ax must be very high impedance. AM car radio co-ax has a very
thin inner conductor. It is nothing like RG58 or 59.

The aforementioned MFJ-1024 is a car radio antenna with an impedance
convertor that can easily drive 100' of RG-58.

On Mon, 29 Nov 2004 18:08:35 GMT, (Mark Zenier)
wrote:

In article .com,
wrote:
Always thought the reason car radios did so well is that they were able
to use the car itself as some sort of antanna. Likely won't be rolling
a jalopy into the office to listen... ;^)

Got a metal filing cabinet?

That said, I have seen your recommendation around a bit, you just
(apparently) have to add an antenna.

Basically, the radio has a built in active antenna circuit designed for
a high impedance short rod. Something similar to the car antenna would
be best. A length of the right coax to a 3-4 foot rod mounted verticaly
outside on a gutter? I think older radios used a special low capacitance
coax, not the 50 or 75 ohm stuff.

Mark Zenier Washington State resident