Microwaves101 has a good introduction to VSWR. **broken link removed**
VSWR is related to the impedance mismatch between your input feed and the device under test. You can achieve near perfect VSWR by achieving a good match between the input and load.
A VSWR of 1.041 would mostly be considered good enough. From an engineering point of view, efforts spent on further reduction might not be that effective (law of diminishing returns).