A tool for communicating data between downhole subs, the tool comprising: a tool body; a first antenna (Tx) comprising a first electrode and a first electronic circuit, the first electrode being disposed within a wall and separated from the tool body by an insulating layer; and a second antenna (Rx) coupled to the tool body, and comprising a second electronic circuit; the second antenna (Rx) further comprising a second electrode disposed within the wall, the second electrode being separated from the tool body by an insulating layer; characterised in that the first antenna (Tx) is disposed in a first downhole sub and comprises a data transmitting antenna; wherein the first electrode is a transmitting electrode, and wherein the first electronic circuit is an electronic driving circuit; wherein the first electronic circuit is disposed adjacent to the first electrode within a first pocket formed in the wall of the tool body; wherein a first metal wire connects the first electronic circuit and the first electrode through a pressure-sealed feed-through connector; wherein the first metal wire does not make electrical contact with the tool body; wherein a second metal wire connects the first electronic circuit and the tool body; and wherein the second metal wire does not make electrical contact with the first electrode; wherein the first electronic circuit is configured to generate an encoded electrical signal comprising data, drive the encoded electrical signal comprising data to the first electrode, and transmit the encoded signal comprising data through the first electrode into a medium surrounding the tool body; wherein the second antenna (Rx) is disposed in a second downhole sub and comprises a data receiving antenna; wherein the second electrode is a receiving electrode, and the second electronic circuit is an electronic receiving circuit; wherein the electronic receiving circuit is disposed adjacent to the second electrode within a second pocket formed in the wall of the tool body; wherein a third metal wire connects the second electronic circuit and the second electrode through a pressure-sealed feed-through connector; wherein the third metal wire does not make electrical contact with the tool body; wherein a fourth metal wire connects the second electronic circuit and the tool body; and wherein the fourth metal wire does not make electrical contact with the second electrode; wherein the second electronic circuit is configured to receive the encoded electrical signal comprising data transmitted from the first antenna (Tx), and decode the encoded electrical signal comprising data; wherein the first antenna (Tx) and the second antenna (Rx) are configured to transmit data between the downhole subs over a wireless channel. a tool body; a first antenna (Tx) comprising a first electrode and a first electronic circuit, the first electrode being disposed within a wall and separated from the tool body by an insulating layer; and a second antenna (Rx) coupled to the tool body, and comprising a second electronic circuit; the second antenna (Rx) further comprising a second electrode disposed within the wall, the second electrode being separated from the tool body by an insulating layer; characterised in that the first antenna (Tx) is disposed in a first downhole sub and comprises a data transmitting antenna; wherein the first electrode is a transmitting electrode, and wherein the first electronic circuit is an electronic driving circuit; wherein the first electronic circuit is disposed adjacent to the first electrode within a first pocket formed in the wall of the tool body; wherein a first metal wire connects the first electronic circuit and the first electrode through a pressure-sealed feed-through connector; wherein the first metal wire does not make electrical contact with the tool body; wherein a second metal wire connects the first electronic circuit and the tool body; and wherein the second metal wire does not make electrical contact with the first electrode; wherein the first electronic circuit is configured to generate an encoded electrical signal comprising data, drive the encoded electrical signal comprising data to the first electrode, and transmit the encoded signal comprising data through the first electrode into a medium surrounding the tool body; wherein the second antenna (Rx) is disposed in a second downhole sub and comprises a data receiving antenna; wherein the second electrode is a receiving electrode, and the second electronic circuit is an electronic receiving circuit; wherein the electronic receiving circuit is disposed adjacent to the second electrode within a second pocket formed in the wall of the tool body; wherein a third metal wire connects the second electronic circuit and the second electrode through a pressure-sealed feed-through connector; wherein the third metal wire does not make electrical contact with the tool body; wherein a fourth metal wire connects the second electronic circuit and the tool body; and wherein the fourth metal wire does not make electrical contact with the second electrode; wherein the second electronic circuit is configured to receive the encoded electrical signal comprising data transmitted from the first antenna (Tx), and decode the encoded electrical signal comprising data; wherein the first antenna (Tx) and the second antenna (Rx) are configured to transmit data between the downhole subs over a wireless channel.