Disagree with you Dick

Corrosion starts on the outside surface of the wire and at RF
frequencies thats where most of the signal is carried (called skin
effect) This is the basic reason you use fatter cables and silver
plating etc at higher frequencies.

The dielectric will also become lossy with water ingress even if you
ignore the impedence change consequences. It becomes a resitive load in
other words.

The question you have to ask is how much loss can the RX system handle.
If the interest is in AM broadcast down around 1Mhz where the
atmospheric/manmade noise is stronger than anything the receiver noise
and cable loss will be, your method would probably be okay. At higher
frequencies though the margin becomes less and less to the point where
the natural "hiss" of the radio w/out the antenna is all you'll hear in
the absence of a "real" signal. For receiving you need a good signal vs
noise ratio.

Cheers Bob

Dick wrote:

If you are just going to use it for receiving, it won't matter if the
jacket rots and the shield braid corrodes. You mainly need an
insulated wire. I would give it even 20 or 30 years as long as you
don't drive over it.

Dick