Twin-lead transmission line (ribbon cable)

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Twin-lead (ribbon cable) used to be common for TV antennas. It has its advantages. But due to its unpredictability when positioned near metal or dielectric objects, it has fallen out of favor. (Such objects, even if not touching the cable, cause a portion of the signal to bounce, return to the antenna, and get retransmitted.)

For UHF, twin-lead should be kept at least an inch away from anything metal, and should not be allowed to touch anything dielectric (plastic).

For VHF, the twin-lead should not be allowed to touch anything metal, even if insulated, and should not lie against anything dielectric.