GPS navigation and differential-correction beacon antenna combination

An antenna system, comprising:

• a microwave receiver antenna for receiving microwave radio transmissions from orbiting global positioning system (GPS) satellites and for connection to a GPS navigation receiver;
• magnetic loop antenna means for connection to said GPS navigation receiver, and proximate to the microwave receiver antenna, and for receiving radio beacon transmissions that include differential correction information;
• and
• radio electrostatic field shielding means comprising a plurality of similarly-oriented conductors that surround the magnetic loop antenna means where each of said conductors is open-ended and has a single connection to ground, wherein parasitic currents that would otherwise desensitize the magnetic loop antenna are prevented by open-ending said conductors;
• wherein, the microwave receiver antenna is oriented in an enclosure for upward vertical hemispherical radio signal reception;
• and
• wherein, the magnetic loop antenna means comprises a pair of ferrite rods mounted at right angles to one another and mounted beneath the microwave receiver antenna in said enclosure for horizontal omni-directional radio signal reception.

An antenna system, comprising:

• a microwave receiver antenna for receiving microwave radio transmissions from orbiting global positioning system (GPS) satellites and for connection to a GPS navigation receiver;
• magnetic loop antenna means for connection to said GPS navigation receiver, and proximate to the microwave receiver antenna, and for receiving radio beacon transmissions that include differential correction information;
• and
• radio electrostatic field shielding means comprising a plurality of similarly-oriented conductors that surround the magnetic loop antenna means where each of said conductors is open-ended and has a single connection to ground, wherein parasitic currents that would otherwise desensitize the magnetic loop antenna are prevented by open-ending said conductors;
• wherein, the magnetic loop antenna means comprises two ferrite rods set at right angles to one another;
• and
• wherein, the radio electrostatic field shielding means comprises a plurality of conductors in a fan arrangement each positioned above, below and between said ferrite rods and spaced away from the magnetic loop antenna means to reduce antenna desensitization.

An antenna system, comprising:

• a microwave receiver antenna for receiving microwave radio transmissions from orbiting global positioning system (GPS) satellites and for connection to a GPS navigation receiver;
• magnetic loop antenna means for connection to said GPS navigation receiver, and proximate to the microwave receiver antenna, and for receiving radio beacon transmissions that include differential correction information;
• and
• radio electrostatic field shielding means comprising a plurality of similarly-oriented conductors that surround the magnetic loop antenna means where each of said conductors is open-ended and has a single connection to ground, wherein parasitic currents that would otherwise desensitize the magnetic loop antenna are prevented by open-ending said conductors;
• wherein, the magnetic loop antenna means comprises two ferrite rods set at right angles to one another with a set of three plates with one each plate positioned above, between and below said ferrite rods;
• and
• wherein, the radio electrostatic field shielding means comprises a flat ribbon conductor laid flat against each of said plates and spaced away from the magnetic loop antenna means to reduce antenna desensitization and having ends of said flat ribbon conductor folded over an end of each of said ferrite rods to embrace at least two of said plates.