Why it matters in the field
Foliage usually affects lower HF less than higher frequencies, while moving branches and wet bark create mechanical and electrical risks at any band.
What to do
Use proper insulators and strain relief, leave movement allowance, inspect seasonally, and never install where a failure can contact power lines.
The common mistake
Pulling wire tight against a live branch and expecting the geometry to remain fixed.
Current regulations, safety clearances, equipment manuals, exact antenna geometry, and site conditions control. Test the complete installed system at low power before relying on it.