In ISA conditions, approximately what is the maximum theoretical range at which an aircraft at FL210 may expect to receive signals from a VOR facility sited 340 feet above mean sea level ?

1) An aircraft at FL 100 should be able to receive a VOR groundstation at 100 FT above MSL at an approximate maximum range of:

2) If VOR bearing information is used beyond the published protection range, errors could be caused by:

3) In ISA conditions, approximately what is the maximum theoretical range at which an aircraft at FL210 may expect to receive signals from a VOR facility sited 340 feet above mean sea level ?

4) The Captain of an aircraft flying at FL100 wishes to obtain weather information at the destination airfield (0ft) from the airfield's VOR. Assuming ISA conditions, what is the approximate maximum theoretical range at which it can be expected to obtain this information?

5) The frequency range of a VOR receiver is: