While shielded audio cable will work, real coax is much better.
Buy some dual shielded, braid with conductive foil, TV style
coax from you local parts outlet, RadioShack will work but it isn't
my first choice. Your receiver is 50Ohms, but even with a 9:1
matching transformer your antenna impedance will vary wildly.
And 75 Ohm instead of 50 ohm is only a 1.5:1 mismatch.
Hardly worth thinking about.
The Doty article on "Low Noise Antennas" is a must read.
His reasoning for burring the coax is excellent and can
help to really knock the noise down.
I say can, because some locations are hard luck and can be
very difficult to reduce the noise.
His approach gives the most result for the work of any I know of.
Terry