Used just a few times Ameristep Aluminum non typical Rapid Rails set of 4 for $75. Custom camo painted and slip resistant tape on the steps. Prefer my lone wolf sticks dont use these any more. Thanks see link for details:
Dave Around 16 to 20 feet depending on how high you place the 1st one then the spacing in between. They also sell a longer extension piece if you want to go higher but this was plenty high for me. Thanks for looking.