The question is WHY would you want to do that?

I could see someone that is a cheapo - trying to save a buck on CopperWeld wire - using a piece of 4 conductor phone wire for a antenna.
But not the phone service connection.

A study was done a long time ago, and it was determined that 48 VDC was the best voltage for use in communications.
It offered some EMF - but not enough power to electrocute someone.
It could be supplied by using 4 - twelve volt batteries, which also helped to isolate power surges and protect their equipment from lightning strikes.

This is also used in radio and also television - 48 Volts.

Connecting a antenna lead from a radio to the phone line would only induce the noise in the line to the receiver.
NOTHING to be gained.

As a example, I knew a guy that thought he knew a little about ham radio.
His license said he was licensed since the 1970's.
He repaired pocket radios as a hobby.
He owned a Heathkit receiver 10 - 80 meters, which a friend had bought.
He liked to listen to 40 meters and he had the antenna connection attached to the metal leg of the metal desk he kept his radio equipment on.
When the band was open - it worked great..

Out of all the bands, 40 meters seems to be the most versitile.

80 meters was mostly noise - that was a given, since the table was inside of his house and 3' off the ground.

20 meters - you could probably hear someone - IF they were close enough or strong enough.

10 meters was non existant- since 10 is not always open.

The question is - what do you want to hear?

Which direction do you wish to receive in and how often do you want to receive something.

You can load up a rain gutter, the soffit / fascia on the house - if it is aluminum.

You can put a loop around the house.

If you were on the third floor of an apartment building and could open a window - you could drop a piece of copper wire down the side of the building at night and no one would notice.

You could even make a loop inside of a room with a simple piece of plastic 1/2 PVC pipe with a couple of evenly spaced holes drilled in it - attached to each corner of the ceiling.

Never connect a radio which wants millivolts of signal into anything that carries 48 volts is my motto. Too much room for error.