If I understand you correctly then, when you are flying IFR and intend to use a beacon or other approach aid you will of course be in contact with ATC of some kind say approach control service or radar, If there is a level free at the beacon you would be so advised. How else could you separate yourself from other traffic in cloud over such a navigation or other beacon unless of course you were flying in VMC and even then there could be risks. In UK when I fly IFR I am kept clear of other known traffic by 4 nm laterally and 1000 ft clear above and below - this is a rule that is operated by the controlling ATC, Perhaps you could add some detail of how you come to ask the question so that we are clear - perhaps you have not studied IFR rules yet?
Last edited by SkyCamMK; 18th Mar 2008 at 17:54.