Basic Omnidirectional: Sky Band Base Antenna
This inexpensive, discone type antenna gives you full-band coverage (25 - 1300 Mhz) at a very reasonable. price.

Better: Ground Plane Scanner Antenna Kit
The Comtelco is a great mobile antenna, now you can use it as a base antenna.

Best: Discone Base Antenna
This Discone antenna is omni-directional and covers the full scanner range of 25 thru 1300 MHz. It is an ideal antenna for most situations and will provide years of service due to its high quality stainless steel construction.

Best Plus: Ferret 8 Band Base Antenna
It doesn't get any better than this! The Ferret is a Multi-element base antenna that provides great omnidirectional coverage on all scanner bands. It doesn't get any better than this!