Jim, SV1LHZ wanted to install a vertical on a single floor house in Peristeri, that is surrounded by taller, 5 story buildings, that their roofs are at least 12m higher  than Jim’s roof. After a lot of discuss & site survey, we installed a Galvanized Telescopic mast with 4 sections. As each section is 4m long, the maximum height of the Telescopic mast is 15m, so the antenna base is at least 3m higher than the average surrounding buildings.