The scenarios being compared are:
- Fob in hand
- Fob in hand, held against head
Both of these already fulfill your “near body” requirement. Your point around tuning would not explain the specific difference being questioned.
- Fob in hand
- Fob in hand, held against head
Both of these already fulfill your “near body” requirement. Your point around tuning would not explain the specific difference being questioned.
And of course different surroundings will also effect the directivity (eg the radiaton pattern).
So some will give better results than others. Why is hard to understand?