Yeah it's the leagues club.
Basically it gives:
- entry to the club and discounts on food/drinks
- voting in the leagues club board elections (I believe)
- attendance and voting at the AGM next year
Football club membership is separate, and costs about $35 a year. You need to be a member for 3 years to vote there. The football club AGM is directly after the leagues club AGM, but is pretty much the same agenda.
The leagues club-football club link is very hard to understand, and someone more expert can advise. If it came down to some massive crisis, the football club voting rights would probably come into play. But in a general year, the leagues club membership does most of what you need in terms of voting etc.