Precision hich signal-to-noise data, obtained within a 1 year period at the Effelsberg 100 m telescope and the NRAO 91 m and 43 m telescopes, are used to determine the effect of resolution on 21 cm parameters. By comparing observations made with different beam sizes, profiles widths are shown to continue to increase outward to the limit of the data. Redshifht is also shown to vary radially for galaxies with significant rotating disks, widths > 100 km/s.