Absolutely, we have had ours mounted on top of our barn about 60 yards (120 feet ) and it works like a champ. Good product, very accurate. 

After the mobile phone and the device are successfully connected, as long as the device is in the WiFi area where you are connected, your mobile phone can remotely view the device data through the APP as long as it is connected to the Internet. Please pay attention to ensure that you are using 2.4GHz WiFi when connecting, and the WiFi area where the device is located has a strong signal to avoid accidental disconnection due to weak signal. Hope this information is helpful to you. 

If it’s a WiFi issue, just put a wireless router or hotspot inside the hanger with the console. But you are probably talking about the 433 MHz RF signal between the sensor and console. My sensor is located above a patio roof with 26 gauge corrugated steel roofing and it works fine through that and a house wall. You can try moving the sensor and console closer together, even if the console needs to be out of site in the rafters. You can then view your data from whatever weather website you connect to. 

Yes, easily. 

Yes, when you use one camera alone, just shorten the other side and fix it under the armpit, then you will have a double shoulder strap.