Problems connecting to wifi

I am having trouble connecting to any WiFi spots with my HTC one mini 2. When I have my WiFi on it does not even recognise that my home WiFi is in range and thus does not connect to it. If I am somewhere that also has WiFi that I had previously been connected to I may on the very rare occasion get connected but this connection does not work, it says it is connected and the icon shows on the top of the screen that I am but I cannot use any internet services and the connection gets lost very quickly. I am wondering what could be the reason behind this? Is it possibly a problem with some sort of antenna to pick up the WiFi or am I way off?