315 MHz Antennas are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for 315 MHz Antennas.

ANT-315-CW-HWR-SMA TE Connectivity / Linx Technologies Antennas SMA Tilt Swivel 1/4 Wave Whip 315MHz datasheet, inventory, & pricing.

TE Connectivity / Linx Technologies HE Series Embeddable 1/4-Wave Monopole Antennas are available at frequencies of 315MHz, 418MHz, 433MHz, 868MHz, and 916MHz. These helical coil antennas …

ISM 315MHz Features Plastic supported helical antenna Size (helix): Length 35.35mm, ø 7mm Low weight (1.8g) Mounting on top of the PWB

315MHz Chip Antenna Features: Size : 12.00x4.00x1.50 mm Omni-directional Radiation Tape & reel automaic

ANT-315-CW-HD TE Connectivity / Linx Technologies Antennas RPSMA Heavy Duty 1/4 Wave Whip 315MHz datasheet, inventory, & pricing.

310 MHz Antennas are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for 310 MHz Antennas.

These 1/4-wave TE Connectivity / Linx Technologies LP Series antennas mount directly to a product's PCB via a single screw and eliminate the cost of a connector while ensuring FCC compliance.

RFDPA Series Antennas are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for RFDPA Series Antennas.

Figure 4 also shows both 315MHz and 433.92MHz ASK configurations for a loop antenna. In addition to using a different crystal, modified values are needed for certain frequencies.