Question E1F05:
[97.303] Amateur stations may not transmit in which of the following frequency segments if they are located in the contiguous 48 states and north of Line A?  

Choices:  
A: 440 MHz - 450 MHz  
B: 53 MHz - 54 MHz  
C: 222 MHz - 223 MHz  
D: 420 MHz - 430 MHz    

Correct Answer is  D: 420 MHz - 430 MHz  

To the point: This question is about the special “Line A” restriction near the U.S.–Canada border. In the contiguous 48 states, if you are north of Line A, one slice of the 70 cm band is off-limits.

Why the correct answer is correct
- $420\text{–}430\ \text{MHz}$ is prohibited for amateurs located in the contiguous 48 states and north of Line A (47 CFR 97.303). This protects Canadian primary services in that segment.

Why the other choices are incorrect
- $440\text{–}450\ \text{MHz}$ (Choice A): Generally allowed north of Line A. There may be separate coordination/power limits in certain areas (e.g., PAVE PAWS in CA/MA), but it’s not a Line A prohibition.
- $53\text{–}54\ \text{MHz}$ (Choice B): Part of the 6-meter band; not subject to Line A restrictions.
- $222\text{–}223\ \text{MHz}$ (Choice C): Part of the 1.25-meter band; not subject to Line A restrictions.

Useful rules of thumb
- Line A is an FCC-defined boundary near the Canadian border. Memorize: In the 70 cm band, if you’re north of Line A (and in the lower 48), avoid $420\text{–}430\ \text{MHz}$.
- If an exam choice lists several VHF/UHF segments, the one that starts at $420\ \text{MHz}$ and ends at $430\ \text{MHz}$ is the Line A restricted one.