Context :

Aims : We present low-frequency radio imaging and spectral properties of a well defined sample of Seyfert galaxies using GMRT 240/610 MHz dual frequency observations .
Radio spectra of Seyfert galaxies over 240 MHz to 5.0 GHz are investigated using 240 MHz , 610 MHz flux densities derived from GMRT , and 1.4 GHz and 5.0 GHz flux densities mainly from published VLA data .
We test the predictions of Seyfert unification scheme by comparing the radio properties of Seyfert type 1s and type 2s .

Methods : We choose a sample such that the two Seyferts subtypes have matched distributions in parameters that are independent to the orientation of AGN , obscuring torus and the host galaxy .
Our sample selection criteria allow us to assume that the two Seyfert subtypes are intrinsically similar within the framework of the unification scheme .

Results : The new observations at 240/610 MHz , together with archival observations at 1.4 GHz , 5.0 GHz show that type 1s and type 2s have statistically similar radio luminosity distributions at 240 MHz , 610 MHz , 1.4 GHz and 5.0 GHz .
The spectral indices at selected frequency intervals ( { \alpha } _ { 240 ~ { } MHz } ^ { 610 ~ { } MHz } , { \alpha } _ { 610 ~ { } MHz } ^ { 1.4 ~ { } GHz } and { \alpha } _ { 1.4 ~ { } GHz } ^ { 5.0 ~ { } GHz } ) as well as index measured over 240 MHz to 5.0 GHz ( { \alpha } _ { int } ) for the two Seyfert subtypes have similar distributions with median spectral index ( \alpha ) \sim -0.7 ( S _ { \nu } \propto { \nu } ^ { \alpha } ) , consistent with the synchrotron emission from optically thin plasma .
In our snap-shot 240/610 MHz GMRT observations , most of the Seyfert galaxies show primarily an unresolved central radio component , except a few sources in which faint kpc-scale extended emission is apparent at 610 MHz .
Our results on the statistical comparison of the multifrequency radio properties of our sample Seyfert galaxies are in agreement with the predictions of the Seyfert unification scheme .

Conclusions :