From the desk of KR4YXX!

For POTA operations, the Yaesu ATAS-120A is best mounted on a tripod using a BuddiPole Vertical Antenna Clamp or a Gabil antenna tripod, which often includes thumbscrews for attaching ground radials.  Operators frequently use the large TIA tripod or modified mini-tripods, ensuring the legs are extended and angled to provide stability against wind. A critical requirement for tripod use is adding a ground plane system; this typically involves installing 4 to 8 radials (often 1/4 wavelength for lower bands like 40m and 20m) to achieve acceptable SWR, as the antenna performs poorly without them. 

For home use with HOA restrictions, the ATAS-120A can be mounted on a balcony rail using a Diamond CRM mount or a Vice Grip, or elevated on a 6-foot mast positioned at rain gutter height to remain unobtrusive. To maintain low SWR in these elevated setups, users have successfully run counterpoise wires inside rain gutters or along the structure, though this requires testing for electrical continuity. Alternatively, mounting the antenna on a ground spike with a robust radial system is an option, though it may be less aesthetically pleasing for some HOA environments compared to elevated, hidden counterpoises. 

YOUTUBE

Tripod!