The evidence are given that the radio source GB2 0909+353 (GB2 catalogue:
Machalski 1978; ICRS 2000.0 coordinates: 09 12 51.7, +35 10 10) is likely one
of the largest classical doubles known, though its optical identification is
not certain. Our deep VLA observations at 5 GHz did not reveal a radio core
brighter than 0.5 mJy/beam at this frequency. Thus a distance to the source is
evaluated using photometric -- redshift estimates of the faint galaxies in the
optical field. The equipartition magnetic field and energy density in the
source is calculated and compared with corresponding parameters of other
`giant' radio sources known, showing extremely low values of both physical
parameters of the source investigated. On the other hand, the age of
relativistic electrons, and the advance speed of the `hot spot' in the source
are typical for much smaller and brighter 3CR sources.Comment: 10 pages with 3 Postscript figures, accepted to Acta Astronomic
