Konrad Zuse's Early Computers: The Quest for the Computer in Germany (History of Computing)

27Mhz ​​CB Radio Antenna (18.5ft) - 150W Heavy Duty Base Station Antenna for 10 & 11 Meters (26-28 MHz) - 3.5 dBi Gain to Enhance Signal Reception and Transmission Range​

Sirio 827 CB/10M Base Antenna, Strong Build, Great for DX

Sirio Starduster M400 CB/10M Base Antenna

FMUSER CB100 CB Base Antenna,18ft CB Radio Outdoor Antenna for Enhance The Signal Reception and Transmission Range of 27Mhz CB Radio System

HYSHIKRA 26-28Mhz Base Antenna, CB 6.2meter (20.3ft) Outdoor Antenna with UHF-Female Connector for Midland Cobra Yaesu Mobile Base Transceiver Radio

Tram® 18-Foot Black CB Base Antenna with 26 MHz to 31 MHz 5.75 dBd Gain

TWAYRDIO CB Base Station Antenna, Heavy Duty 20Feet 100W 27MHz Base Antenna for 10Meter 11Meter CB Radio Transceiver

UAYESOK 20ft CB Base Station Antenna, 27MHZ Aluminum Alloy CB Base Antenna, 3.5dBi High Gain & Low VSWR & All-Weather Resilience & Pre-assembled