Internet bridge from house to shop.
Below is a table showing the loss of Wi-Fi signal efficiency as it passes through different environments. Values (not absolute but approximate) are given for a wireless network operating in the 2.4 GHz frequency band.
| Obstacle | Additional losses (dB) | Effective distance* |
| Open space | 0 | 100% |
| Window without tinting (no metalized coating) | 3 | 70% |
| Window with tinting (metalized coating) | 5-8 | 50% |
| Wooden wall | 10 | 30% |
| Interior wall (15.2 cm) | 15-20 | 15% |
| Bearing wall (30.5 cm) | 20-25 | 10% |
| Concrete floor/ceiling | 15-25 | 10-15% |
| Monolithic reinforced concrete slab | 20-25 | 10% |
* Effective distance — means how much the Wi-Fi signal range will be reduced after passing the corresponding obstacle compared to the open space.
Taken from help.keenetic.com