A helical UHF transmitting and/or receiving antenna for electromagnetic waves in the frequency range of between 400 MHz and 1000 MHz. The helical antenna is arranged within a closed housing which is permeable to HF radiation. The UHF signal is supplied to an end of the helical antenna through a coaxial...http://www.google.com/patents/US5146235?utm_source=gb-gplus-sharePatent US5146235 - Helical UHF transmitting and/or receiving antenna
