  An FRII radio source with an angular extension of 18.4 arcminutes has been
discovered in the Westerbork Northern Sky Survey that is being carried out at
325 MHz. This source is identified with Mrk 1498 at $z=0.056$ indicating that
its projected extension is 1.6 \h50\ Mpc. The optical spectrum of Mrk 1498 has
the typical emission lines of a narrow line radio galaxy; H$\alpha$ is the only
permitted line that has a faint broad component. The discovery shows that the
good sensitivity of WENSS at low frequencies to low surface brightness features
at scales of a few minutes, is uniquely suited to provide well defined and
relatively large samples of giant radio galaxies. The future definition of such
samples will be important for our understanding of giant radio galaxies.
