| The scientists used pairs of antennas similar to those used in ordinary FM radio receivers. |
| By building more complicated antennas, engineers can control the direction in which the radio wave is sent. |
| And how many unused rooftop antennas are taking up airspace above cable-wired houses? |
| Portable receivers and hand-held 3 element Yagi antennas were used to radiotrack coyotes. |
| There were no cable lines connected to the house, no antennas mounted on the roof, and no satellite in the yard. |
| If you need to go further, switch to higher-gain antennas or gang two WRT54Gs together. |
