This folded dipole, can be even built for 10 and 20 meters band, and can also give good results on 15 meters, with the sole lenght of just 20 meter of total lenght. Originally born to work on 40 meters, can be adapted for any band.
DC Distribution Box with Reverse Voltage, Over Voltage and Transient Protection, A multi-way DC distribution board. Standardised connections to protect against accidental reverse connections. Diode protection, incorporating a transient suppressor. An over-voltage crowbar circuit. Option to add a digital volt meter display
A small sized and very cheap antenna project that allow you to work on WARC bands with a total gain very close to the dipole in both bands. On 12 meters is a normal dipole, while on 17 is a trapped dipole. Article in Italia