There are typically three to four 3G antennas that we recommend for improving mobile phone and 3G internet service based on the terrain, vegetation, and distance to the base station. The other antennas listed here are suited to more unique situations.
All these antennas must be plugged in to either a Smart Repeater to broadcast phone service inside the building, or connected directly into your modem or mobile phone with a patch lead.
As for improving Telstra 4G internet service, we recommend you read our Guide to 4G. This list should provide general guidance.
Learn more and read our Guide to Selecting an Outdoor Antenna.