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need help on getting/making a 433.9 MHZ antenna

I purchased a garage door monitor. Basically, the sending module attaches my garage door and the receiving monitor is inside my house. The monitor tells you if the garage door is open or close. The company I purchased it from advertises it has an 800 feet maximum range. I'm getting about 50...
- stanlam
- Thread
- Sep 3, 2011
- Replies: 16
- Forum: Amateur Radio Antennas

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