18 Single person operation: specific location scenarios
Walking and talking
Once your reporter is on the move, there's little choice other than a radio mic to avoid cable hazards. Assuming it's a clip mic, when he/she walks around, you have no control over its relationship to other sound sources, since it's in a fixed position, clipped to their clothing. So, if, for example, they move close to workmen using power tools or pneumatic drills, you cannot adjust the balance of their speech relative to the background noise.
This will almost certainly prove intolerable unless the source of the noise is in vision, which at least helps to explain its aural presence. But you will still be unable to adjust the balance between voice level and noise. However, ...