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We have observed the BL Lac object Markarian 501 at 1.4 GHz with the HighSensitivity Array and at 86 GHz with the global VLBI mm array. Thanks to thegreat resolution and sensitivity provided by these instruments, we proberegions of the radio jets never accessed before. The new data at 1.4 GHz allowus to map the one-sided jet at large distances from the core, and to constrainjet properties thanks to the high jet to counter-jet brightness ratio. The 86GHz data give us a high resolution image of the nuclear region. Puttingtogether these new results and available published data we discuss theproperties of this source from sub-parsec to kiloparsec scales.

The jet of Markarian 501 from the sub-parsec to the kpc scale