trickle charger for cars that sit/Odyssey charger

Hey, thanks for all this. We ended up with the battery Tender, which is working well.. even kind of topping up the battery when the alt. won't. It's an Alfa, what can I say. So now we're looking at one for a jeep that sits for 6 months every year unused at a summer cabin. I'm not comfortable keeping it plugged in for 6 mos unattended, any thoughts you guys? At least the garage is seperate from the house, in case the battery explodes