If you have to rent anyway why not just rent the proper equipment.
Bucket truck or boom lift.
Or you can probably have a contractor come and do the work for you for about the same price as you would pay for equipment rental.
If you have to use a basket, make sure it is chained to the lift and use a harness. Still your safety is in the operators hands, if you don't have an operator you trust, don't go up.
GJ
