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I built an FM transmitting antenna using 75 ohm RG59 copper mesh shielded coax.
I removed the last 30.375 inches of the outer insulation and pulled the center conductor out. I stretched the shield one way and the center conductor the other, ending up with
a 60.75 inch half wave dipole with an impedance of 75 ohms. I installed it in some pvc pipe and made a three turn loop to keep reflections from the antenna down. It is used with a very low power RF source, probably about 50 milliwatts. Got reception in my car a block from home before the signal began fading. Came home and immediately turned the RF down to the lowest setting possible! It works great.
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