High-resolution 144 MHz LOFAR image of RXJ1720.1+2638. The contour levels start at 3σ, where σ = 200 μJy beam⁻¹, and are spaced by a factor of two. The negative contour level at −3σ is overlaid with a dashed line. The beam is 14′′ × 9′′ and is shown in grey in the bottom left corner of the image. We note the presence in the field of a wide-angle tail radio galaxy located to the south-east of the cluster centre, which is associated with a cluster member galaxy at z  =  0.159.