What ever you have that's ready to tune, I.E car radio, portable radio, ipod if solo. Just like every other drive inn.
Just remember to be prepared for car battery use if using your car stereo :-) The drive-in requires several hours of discharging car battery. If you show up early, it could be up to 7 hours (if using radio/phone chargers while waiting). Have jumper cables at the very least. If you plan on going frequently, a $30 car battery charger/jumper is a great idea, especially since these can also charge phones. No one wants to be stuck in Newberg at 1 AM, and management does not assist in getting cars out of there at closing. A good old-fashioned big, portable boom box is perfect for the drive-in. They have strong FM receivers, provide enough quality sound/bass to make up for your car speakers, run on a handful of dollar store batteries, and fit nicely in the back.
Your regular car radio works great or any radio that you can get 96.5 when you get there.
My dad always brings a radio, and I always go off of my car radio. Just turn it to 96.5 when you arrive!
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