As 1) states "it works fine for me". Choosing options 2,3 or 4 may suggest that the original supplied aerial didn't work fine ?
My originally supplied aerial worked fine, but I elected to fit an external aerial simply to increase reception. As I erected it myself I am tempted to vote for 3), but am very nervous of doing so as I fear this could imply that I am suggesting the originally supplied aerial was something other than "fine". I'd hate to be banned or criticised by other forum users for what could be perceived as a negative comment towards AN, whereas this is not the case at all. Just to reiterate (before I get flamed by the usual people !) , the originally supplied aerial is fine. In fact it is more than fine, I can't even think of a suitable superlative adjective to describe it.