Low Earth Orbit (LEO) remote sensing missions present a main limitation regarding their revisit time of several days or weeks. They cannot provide continuous monitoring over the same area of the planet. The on-going studies on Geosynchronous Synthetic Aperture Radar (GEOSAR), which have a revisit time of less than 24 h, aim to mitigate this limitation [1] . Since high altitude GEO missions are beyond MEO navigation satellites coverage, a ground based interferometric system (GEODE) has been developed for GEO Precise Orbit Determination, a requirement to form focused GEOSAR synthetic apertures [2] . Since no operational GEOSAR missions are available yet, present Geostationary telecommunications satellites can be used as transmitters of opportunity for GEODE experimental testing and validation. Recent results show the convenience of using ground reflectors to extend interferometric baselines lengths up to kilometers to achieve the required GEOSAR orbit precision. Locating stable reflectors of opportunity for interferometric orbit determination in urban areas is possible by complementing the ground interferometer with a multistatic SAR imaging processor capable to map the surrounding scattering centers.