A radio interest group session was held at the 2021 May interop meeting on May 25th. Mark Kettenis presented a description of the implementation of VO at JIVE. He discussed the particular issues associated with putting VLBI data into the VO. In particular, concepts associated with the representation of the uv-plane, and how to map radio observations onto ObsCore. -Baptsite asked about solar system data, Mark replied that they do have data from observations of spacecraft, but they have not tried to put them into the VO yet. Yan Grange discussed the inclusion of Fast Radio Burst (FRB) data from the APERTIF radio transient system (ARTS) in the APERTIF long-term archive (ALTA). ALTA is based on VO standards. Datastreams from detections are placed on spinning disk, and those for non-detections on tape. A cone search form is available, linked to PSRFITS files. Physical parameters of detections are stored in TNS (https://www.wis-tns.org), so no need to store them at ASTRON. LOTSS DR2 is also coming soon, and will probably need cutout services due to the large size of the images. -Yan and Baptiste suggested a new dataProductType of dynamic spectrum for observations of Pulsars, FRBs etc (which could be a time series for non-periodic events or phased up for periodic ones). It was also pointed out that this was something optical spectroscopists may also be interested in. It was also suggested by Ada that the TNS may consider implementing TAP. Peter Teuben presented a discussion of single dish (SD) radio data in the VO. SD data are produced by a wide variety of facilities, and cover a range in science from Pulsars and FRBs through to mm-wave imaging. Many use some form of FITS (PSRFITS, SDFITS etc). Peter's work is currently focussed on the LMT archive, which can map data to ObsCore, but e.g. units may need some work. - Francois noted hat he was interested in standardizing the data mime types to include some of these standards. Julio Alvarado from Arecibo discussed the Arecibo Observatory archives that are currently being set up. The dataset consists of 3PB of data from 1800 proposals (mostly astronomy data in PSRFITS format, but some planetary and ionospheric projects) that have been uploaded to the Texas Advanced Computing Center. They plan to use the VO DAL to enable access to the archives. Finally, Francois Bonnarel gave a brief update on the Radio Astronomy Implementation Note that has been prepared by the Radio Interest Group over the past year. This is now available at: https://www.ivoa.net/documents/Notes/RadioVOImp/index.html