A radio source of the Fanaroff–Riley type II with the angular size of 11.3 arc min is identified with an optical galaxy at z = 0.229 .
Thus , the projected linear extent of the radio structure is 3.14 Mpc which makes it the third largest classical double radio source known after 3C236 and WNB2147+816 .
The high-frequency VLA observations , a galaxy identification and its optical spectroscopy are reported .
The equipartition magnetic field and energy density in the source is calculated and compared with corresponding parameters of other giants known , indicating that either parameter of the source investigated is extremely low .
On the other hand , the age estimate of relativistic electrons and the advance speed of the lobe material are comparable to the respective parameters characterizing other low-luminosity giant sources , as well as much smaller and brighter 3CR sources .
The environment analysis suggests that J1343+3758 lies in a significantly poor region of intergalactic medium .