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Actually most use the AC Ground as the other "phantom half" of your antenna... Of course YOU will not get access to that circuit because errors there could cost your life.
You COULD try stripping back some of the insulation and extending that single wire to a longer wire?
Wire placement will be a factor too so try moving that longer (and stock wire) around for BEST reception.
I tried to find a "service manual" and schematic to help more, but I could find none... these items are mostly throwaway now because the cost of labor and STOCKING specific parts is too expensive!
Both of my Marantz receivers use a 75 ohm coax input. The receivers included a single wire antenna that simply plugs in. The plug is suitable for coax cable going to an external antenna. You can also get a small 75 to 300 ohm transformer that will allow you to use a dipole or other common indoor FM antenna.
static sound on AM band can be reduced by the adding of a capacitor to the alternator terminal. Check the coax cable especially the outside braid is connected to the body for earth
Radio Shack has an adapter catalog number 278-0291. It takes some effort to push the 278-0291 adapter onto the FM UNBL 75 ohm terminal so wait until you have the 278-0291 installed before you connect your 75 ohm coax on to your new adapter.
This will resolve your FM screw on F connector antenna interface issue.
I see others trying to help suggest using a 300 ohm to 75 ohm transformer match unit, this isn't what is needed. Your receiver antenna input IS a 75 ohm input.
This is almost ALWAYS caused by a problem (a short OR an open) in the coax cable from the VHF radio to the antenna. An easy way to check is to JUST insert the PL-259 connector into the socket of the radio, making sure that ONLY the center pin is making contact with the socket. If the weather channels come in clearly, then it's usually an easy fix. Simply check the connections at each end of the coax, looking for a poor center pin solder connection or perhaps a bit of the ground braid is shorting out the center lead. A magnifying glass is a great tool to spot problems.
If the coax proves NOT to be the problem, then the fault is likely to be in the radio itself and is probably a bad solder connection where the antenna chassis mount attaches to the PC board.
There is only one antenna connection. That is the wire or pin in the middle of the coax connector where the old antenna was connected. Hook that to your new antenna, the other connectors are usually at ground potential and won't help a bit. Often a piece of wire the same length as the old antenna will work fine. Stretch it in the vertical position as was the old antenna.
No, you won't get significant signal in the FM spectrum from your satellite LNB coax. The dish is tuned to pick up signals of a very different frequency, and aimed to reject any signals not coming from a very specific direction -- up where the satellites are.
For FM, you need to receive signals from ground-based transmitters, in a different frequency range.
That said, you can totally use the coax to bring signals from your rooftop down to your stereo. To do this, you'd need to get up on the roof, disconnect the coax from your satellite dish and attach it to an FM antenna.
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