I keep mine in the garage on a Battery Tender year round. Sometimes it sits for a month or so before I get to do anything with her (actually its been parked since I returned from a show in May

). If you are for sure its going to be 6 months or longer I'd add, top the fuel tank off and put in a fuel stabilizer like Sta-Bil 360. Some might say add extra air to tires but I've never done that. I'm sure others will chime in with some great advice!
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Jim Zorgias
1994 ZR-1 Admiral Blue/Black #245
1996 Callaway Supernatural 450
1990 Callaway Supernatural 490 / CR-1 #7