Cluster RBS 797 at LOFAR and VLA frequencies. Top panel: VLA image at 1.425 GHz of the cluster RBS 797. Colours, white, and magenta contours refer to the image at resolution of 7″ × 5″ obtained after the subtraction of the central sources. The noise is σ_rms = 0.02 mJy beam⁻¹. White contours start at 2σ_rms and increase by a factor 2 each. The −3σ_rms contour is displayed in magenta. Cyan contours refer to the image of the central source obtained imposing an inner UV-cut of 10⁴λ and start at 3σ_rms = 0.02 mJy beam⁻¹, where the beam is 2.4″ × 1.2″. Cyan contours increase by a factor 2. Bottom panel: LOFAR HBA image at 144 MHz of the cluster RBS 797. Colours, white, and magenta contours refer to the image at resolution of 7″ × 5″ obtained after the subtraction of the central sources. The noise is σ_rms = 0.1 mJy beam⁻¹. White contours start at 2σ_rms and increase by a factor 2 each. The −3σ_rms contour is displayed in magenta. Cyan contours refer to the image of the central source, obtained imposing an inner UV-cut of 8 × 10³λ and start at 3σ_rms = 0.3 mJy beam⁻¹, where the beam is 3.1″ × 2.1″. Cyan contours increase by a factor 2. The white arrow indicates the new western plume discovered with LOFAR.