Rwy 35 thld lts unsvc due to twy WIP. Trees each end of rwy. Rwy 35 apch obst by ant 470' high 5428', 433' high 2352'; 440' high bldg 4800' S of Rwy. Acft advs use N twy to avoid deteriorated pavement. Hi tension cable 2593' long acrossSan Juanico Strait aprx 1.2 NM NNW of arpt 157' mid span rising to 289' at bothends.