So, this is interesting: I came across several studies that analyse the effect of different emf radiations on plants in different stages of their growth. Microwaves are also part of which, so I decided to put on my sensor and go for an RF walk! This is the beta version of the sensor. It looks incredibly rough and ugly, but still small in size and works fine.
It seems quite interesting using natural surfaces, as skin or leaves as a reflector to sensor readings. 
It could be fun walking around with it. Adding a small data logger chip to the sensor, can help us record and visualize data over time, from different walks.
The visualizations using reflections on plants and body are quite interesting; something that is worth further investigations in the future iterations.
The video below sumus up what happened at the park. Watch in HD for best quality.