The installation of a stick HF antenna brings it very close of one of the GPA 017 that i have. About 6 inches. The HF can transmit 150 watt. What would be the prudent minimal distance between the HF antenna and the GPA 017 antenna ?
You have a very good chance of damage to your GPA017 GPS antenna. Due to power output by the HF system, the distance is recommended to be 4 meters or greater between the GPS antenna and the HF antenna. (1 meter for VHF or transmitting AIS)