Coax Solutions Ltd offers a full range of in house cable assembly solutions.
Belden 1694A -RG6U type low loss serial digital coax cable. Suitable for SDI, HD-SDI and UHDTV applications to 6GHz.
Belden 1694A data sheet here: Belden 1694A Data sheet.pdf
Belden Recommended Transmission distance chart here: digital-video-distance-chart-24-4-2019.pdf