A lightning protection system comprises an Early Streamer Emission (ESE) air terminal (14) and a plurality of Delayed Streamer Emission (DSE) element (18) strategically spaced around said ESE whereby the protective radius of said ESE terminal is extended and lightning is directed to the said ESE air terminal. A DSE element (18) has a plurality of upwardly diverging finials (20) with pointed tips, an insulating body (22) and an internal resistor (24) forming a series impedance between said finials and an earth plate (26) on which a series of DSE elements are mounted to provide a DSE device.
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