Wealden District Council dismissed an appeal by O2 after its original planning application was turned down in August 2007.
Planning inspector Elizabeth Lawrence made a visit to the site on Eastbourne Road and concluded the 12.5 metre mast would 'seriously and unacceptably harm the character and appearance of the area'.
Ms Lawrence added, "I appreciate there is a need to upgrade telecommunications coverage in the area.
"However, no information has been provided about the search area.
"No details are given regarding the number and siting of alternative sites closer to the centre of the settlement."
The parish council raised objections on health grounds but Ms Lawrence said, "The fears are relevant to my decision but I do not consider the health concerns raised are sufficient to justify dismissing the appeal."
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