This paper deals with the development of an airborne platform for measuring transient or broadband CW electromagnetic (EM) fields. The considerations and guidelines [1] useful in designing such a platform are discussed. The EM problem consists of choosing the appropriate sensor type and location on an aircraft such that the scattered fields from the aircraft and the sensor mountings do not significantly couple to the sensor, while measuring the Incident field. These design considerations were applied In specifically designing a nose boom B-dot sensor for the NASA F-106 B aircraft [2]. Sample experimental results [3] with comparisons to calculated Incident fields are also presented.