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My GM has been on a chimney strap mount and a 14 foot mast for the last two years. About a year ago I cut the mast just above the chimney to install a HD-73 alliance bell shaped rotor. The next week I installed a 4 element yagi about 9 feet below the GM. The two things I'd like to point out are I carefully tested the performance of the GM before and after the Yagi was installed under it. No change at all could be detected in GM's VSWR or the signals of any local stations I had been working. Bell shaped rotors are usually much stronger than the design Radio Shack sells. A friend a few towns away did the same install with an Antron 99 and Radio Shack rotor. The housing of the rotor broke and took both antennas out with it.

[QUOTE="Shockwave, post: 400710, member: 10882"] My GM has been on a chimney strap mount and a 14 foot mast for the last two years. About a year ago I cut the mast just above the chimney to install a HD-73 alliance bell shaped rotor. The next week I installed a 4 element yagi about 9 feet below the GM. The two things I'd like to point out are I carefully tested the performance of the GM before and after the Yagi was installed under it. No change at all could be detected in GM's VSWR or the signals of any local stations I had been working. Bell shaped rotors are usually much stronger than the design Radio Shack sells. A friend a few towns away did the same install with an Antron 99 and Radio Shack rotor. The housing of the rotor broke and took both antennas out with it. [/QUOTE]

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