A comparison of multiband dipoles, including jumpered dipole versus fan dipole antennas, dipole fed by ladder line, resonant dipoles antennas. ARRL lab notes
Receiving and decoding 433 MHz radio signals from wireless devices
Arduino-based Automatic Amateur Radio Antenna Tuner
An interesting presentation of a real multiband Fan Dipole antenna, optimized for better DX operation performances, considering the terrain, position, DX destination path and other influencing factors
Decoding 433MHz-transmissions with software-defined radio.
The K3NG Keyer is an open source Arduino based CW (Morse Code) keyer with a lot of features and flexibility, rivaling commercial keyers which often cost significantly more.
Aircraft can also be used to increase communications range, by using Aircraft Scatter