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The barred galaxy NGC 7479 hosts a remarkable jet-like radio continuumfeature: bright, 12-kpc long in projection, and hosting an aligned magneticfield. The degree of polarization is 6%-8% along the jet, and remarkablyconstant, which is consistent with helical field models. The radio brightnessof the jet suggests strong interaction with the ISM and hence a location nearthe disk plane. We observed NGC 7479 at four wavelengths with the VLA andEffelsberg radio telescopes. The equipartition strength is 35-40 micro-G forthe total and >10 micro-G for the ordered magnetic field in the jet. The jetacts as a bright, polarized background. Faraday rotation between 3.5 and 6 cmand depolarization between 6 and 22 cm can be explained by magneto-ionic gas infront of the jet, with thermal electron densities of ~0.06 cm**(-3) in the barand ~0.03 cm**(-3) outside the bar. The regular magnetic field along the barpoints toward the nucleus on both sides. The regular field in the disk revealsmultiple reversals, probably consisting of field loops stretched by a shearinggas flow in the bar. The projection of the jet bending in the sky plane is inthe sense opposite to that of the underlying stellar and gaseous spiralstructure. The bending in 3-D is most easily explained as a precessing jet,with an age less than 10**6 years. Our observations are consistent with veryrecent triggering, possibly by a minor merger. NGC 7479 provides a uniqueopportunity to study interaction-triggered 15-kpc scale radio jets within aspiral galaxy.

Radio Continuum Jet in NGC 7479