You could put a piece of metal (any kind) a short distance behind the antenna to act as a reflector. This will increase the range also.
Solution for Weak HomeLink Performance
I posted this comment in another thread, but felt that it could use some more exposure:
My Magnum EVIC HomeLink (despite the dealer replacing it once) did not have the range of my 300M, nor the hand-held remotes. I solved it by lengthening the garage door operator antenna by a fractional wavelength. That is to say I doubled the length of the OEM opener antenna.
All you need to do is:
1. Get a piece of 18-22 gage (not important) wire exactly as long as the existing antenna (you will have to guess the length in some cases when the wire disappears into the housing).
2. Use a butt connector to join the stripped ends of the existing wire and the new one.
3. Let it hang down from the opener.
Now the Magnum hits the opener from a reasonable range and the others can hit it from about 100m away!
My Magnum EVIC HomeLink (despite the dealer replacing it once) did not have the range of my 300M, nor the hand-held remotes. I solved it by lengthening the garage door operator antenna by a fractional wavelength. That is to say I doubled the length of the OEM opener antenna.
All you need to do is:
1. Get a piece of 18-22 gage (not important) wire exactly as long as the existing antenna (you will have to guess the length in some cases when the wire disappears into the housing).
2. Use a butt connector to join the stripped ends of the existing wire and the new one.
3. Let it hang down from the opener.
Now the Magnum hits the opener from a reasonable range and the others can hit it from about 100m away!
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