FireArm,

Yes - Clipping a single piece of Phone Wire on to the Tip
of the Whip Antenna will work.

The better Idea may be InDoor Loop Antennas :

Try taking a single piece of Phone Wire and form it into an
Around-the-Ceiling Loop Antenna. You will create an InDoor
Horizontal Loop Antenna between 32' - 44' long.

Or taking a single piece of Phone Wire and form it into an
On-the-Wall {Inverted} Delta Loop Antenna. You will create
an InDoor Vertical Loop Antenna between 24' - 36' long.

From where the two wire ends that form the Loop meet; Twist
the two wire ends together to form a Twisted Pair of Wires
to extend to the Radio.

Connect the Two Ends of the Twisted Pair from the Loop Antenna
to a 1/8" Mono-Plug. Plug the 1/8" Mono-Plug into the Radio's
External Antenna Jack.

iane ~ RHF
. . . . .