Valporquero HF 3 MHz test

Underground station (-80 m.) Sil de las Perlas, Valporquero cave, León,

(Yaesu FT817ND, 0,5 w RF power, WormAnt antenna, 80 m. band)

Two surface stations:

• Point A: distance 240 m (WormAnt antenna).
• Point B: distance 980 m. (SoilAnt antenna).