4 ms·But it will rust and eventually fall down, so doesn't the cost show up at some later point anyway?by kzrdude 5y agoBut it will rust and eventually fall down, so doesn't the cost show up at some later point anyway?dboreham 5y agoThe tower sites are maintained.tyingq 5y agoThere's usually other antennas on the tower for cellular or VHF/UHF, so the tower itself is maintained. And the microwave horns and waveguide are typically aluminum and/or copper.