Multifrequency radio observations of the gravitational lens system 1938 + 666

We present the results of multifrequency VLA, MERLIN and VLBI radio observations of the radio source 1938 + 666, and show that its properties are consistent with gravitational lensing. By matching radio spectra and polarization properties, we identify which components are likely to be gravitational images of the same part of the source. Using a simple lens model, we show that the image configuration is consistent with lensing by a galaxy, represented by a potential with a small ellipticity.