Uniden 5.8Ghz phone.

You need to reset the main base unit. Unplug the power from the back of the base. While the power is disconnected, press and hold the delete key while reconnecting the power. Wait for a long beep tone. When the display shows 88 or P, press play button one time. If you have a phone without an answering machine, disconnect the power from the back of the base, press and hold find hs button while reconnecting power.

Don't be a scab. The Base is %)&%. Lash out. Spend $70.00 AU & update. Remember: A microwave operates at 2.4Mhz. A handset at your ear at twice that? Very little Watts, but still?
Prefer lower frequency for ground base penetration. WHY do you want or need such penetration?