Ground penetrating radar equipped with a special unshielded 50 MHz Rough Terrain Antenna
(RTA) and a shielded 250 MHz antenna was recently used in Slovenia to investigate the capability of this
geophysical method for detecting cave sediments of unroofed caves. The GPR technique was combined with mineralogical methods and geomorphological mapping.

Čeru, T.; Dolenec, M.; Gosar, A. Application of Ground Penetrating Radar Supported by Mineralogical-Geochemical Methods for Mapping Unroofed Cave Sediments. Remote Sens. 2018, 10, 639.

Read the open access paper (acknowledging COST Action TU1208) here:
https://doi.org/10.3390/rs10040639