A scanning SQUID microscope based on High Temperature Superconductor (HTS) do SQUIDS was developed. An extremely soft magnetic antenna was used to guide the flux from room temperature samples to the liquid nitrogen cooled SQUID-sensor. The sample was moved under the cryostat with a computer controlled xy-scanning stage. A lateral resolution of better than 10 gin. could be achieved for the determination of the position of current carrying thin wires. This is an improvement of a factor of about five compared to existing commercial SQUID microscopes without flux guide.