Rotatable Antenna with Phased Elements based on the orignal design concept of HB9CV antennas, is considered to have an higher gain than standard quad antennas. The Swiss Quad Antenna does not need any spreader or boom.
An interesting article that compares tube amplifiers versus transistor amplifier.
160 Meters on the 3-element 80 Meter Vertical Yagi antenna
Iambino is a Iambic Keyer for Arduino running hardware containing an ATmega328 or ATmega32u
Antennas for the 1296 MHz based on the construction plans of some Yagis 35 elements by DL6WU, F9FT, DJ9YW. These antennas features a boom of about 3 m and gives a gain of about 17.8 dBd
This calculator is designed to give the critical information of a particular beam antenna, in this case a three element Yagi, for the frequency chosen.
Automatically input GPS location data from an Android device to the transceiver, Compatible with IC-7100, IC-9100, IC-9700, ID-4100A/E, and ID-5100A/E.