If you're really lucky, you'll hear Part 15 operations, either AM broadcasters or CW, in that band. Part 15 allows about 2 mW ERP in this band (13553-13567 kHz). But most activity is RFID or other ISM equipment.
I want to know how you get 2 mw on 13553 -13567 MHz. which is 15,848 uV/m @30 meters when walkie - talkies are 10,000 uV/m@3 meter or 100 mw? Just curious.
Assuming a unity gain antenna (isotropic), the formula to determine ERP is (E
2D
2)/(30 * pi), where E is in volts per meter, and distance is in meters. At 3 meters, it translates to 0.3 * E
2, and at 30 meters, it's 30 * E
2. Check FCC OET 63 for the exact wording and formula.
At 15,848 uV/m (0.015848 V/m) and 30 meters, that comes out to 7.5 mW ERP, so I stand corrected there. Maybe it was 2 mW under previous rules.
BTW, that 10,000 uV/m @ 3m field strength is actually about 30 microwatts ERP. The old "100 mW input and a one meter build-in rod antenna" rule has been moot for years. Since CB radio is no longer licensed, it was removed. That rule still apples to devices operating in the 49.82-49.9 MHz band, other than cordless phones.