  High sensitivity observations of radio halos in galaxy clusters at
frequencies lower than 330 MHz are still relatively rare, and very little is
known compared to the classical 1.4 GHz images. The few radio halos imaged down
to 150-240 MHz show a considerable spread in size, morphology and spectral
properties. All clusters belonging to the GMRT Radio Halo Survey with detected
or candidate cluster-scale diffuse emission have been imaged at 325 MHz with
the GMRT. Few of them were also observed with the GMRT at 240 MHz and 150 MHz.
For A1682, imaging is particularly challenging due to the presence of strong
and extended radio galaxies at the center. Our data analysis suggests that the
radio galaxies are superposed to very low surface brightness radio emission
extended on the cluster scale, which we present here.
