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If the antenna is installed properly you should see no difference. If you do its because you've got common mode and the coax is forming part of the antenna which you do not want both because you get RF in the shack as well as interference to other devices when you TX and additional noise when you RX.

Whether you use 2ft of coax, 20ft or 200ft or anything inbetween you should see the same SWR with a properly installed antenna.

[QUOTE="M0GVZ, post: 526120, member: 22312"] If the antenna is installed properly you should see no difference. If you do its because you've got common mode and the coax is forming part of the antenna which you do not want both because you get RF in the shack as well as interference to other devices when you TX and additional noise when you RX. Whether you use 2ft of coax, 20ft or 200ft or anything inbetween you should see the same SWR with a properly installed antenna. [/QUOTE]

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