| 主权项 |
1. A dish for use in a manhole opening covered by a manhole cover, the dish seated underneath the manhole cover, the dish comprising:
a shell having a peripheral lip; a plurality of transmitting plates disposed on the peripheral lip, the transmitting plates configured to transmit a signal at a predetermined frequency; a ground out assembly having a processor, a ground sensor, an input and a wiring system, the wiring system electrically connected to each of the plurality of transmitting to the input, the input configured to receive an electrical signal, wherein the ground sensor detects if a plate is grounded, and the processor directs electrical signals from the input to each of the plurality of plates that are not grounded, and wherein each of the plurality of plates transmit the signal through the manhole cover. |
