A weak cell signal costs you dropped calls, failed data transfers, and constant frustration. Before dropping $200–$2,000 on a signal booster or repeater system, you need answers that separate legitimate vendors from oversellers. Here are the critical questions that will reveal whether a vendor truly understands your building and network environment.
What's Your Coverage Map for My Specific Location?
Ask the vendor to pull your exact address and show you predicted coverage before and after installation. Reputable booster vendors use FCC databases and carrier maps to estimate signal strength in decibels (dBm). They should tell you whether you're dealing with a weak outdoor signal that a booster can amplify, or dead zones caused by dense building materials where you need a distributed antenna system instead.
If a vendor gives vague promises without location-specific data, walk away. A legitimate assessment takes 5–10 minutes with your address and building type (apartment, office, warehouse).
What Frequency Bands and Carriers Does Your Equipment Support?
Signal boosters work on specific frequency bands. A booster certified for LTE Band 4 (AT&T) may not help a Verizon customer relying on Band 13. Ask the vendor:
- Which carriers and bands does the system support?
- Will it work with 5G, or only 4G LTE?
- Does it handle all three major carriers simultaneously, or do I need separate units?
Modern multi-band boosters ($500–$1,200) typically cover AT&T, Verizon, and T-Mobile simultaneously. Cheaper single-band models ($150–$400) often lock you into one carrier. Know your priorities before comparing quotes.
What's the Realistic Coverage Area in Square Footage?
Vendors often inflate coverage claims. A booster rated for 32,000 square feet works best in open office layouts, not cluttered warehouses with concrete walls. Ask:
- What's the coverage area under typical conditions (mixed drywall and wood)?
- How does signal strength degrade with distance from the main antenna?
- Will I need multiple repeater units for my building, and what's the cost?
Most boosters cover 2,000–5,000 sq ft effectively in residential settings. Larger commercial spaces need either distributed antenna systems or multiple boosters daisy-chained together, which adds $500–$1,500 per unit.
Do You Provide Professional Installation, and What's Included?
Installation quality determines whether you get promised performance. Ask:
- Do you handle installation, or does the customer?
- What's the typical timeline (same-day, week-long)?
- Will you optimize antenna placement for your specific building materials?
- Is there a service guarantee if speeds don't match your expectations within 30 days?
Professional installation typically costs $300–$800 on top of equipment price. Many vendors offer this; others force you to DIY, which often results in suboptimal placement and weak results. Factor this into your total budget.
What FCC Certifications and Carrier Approvals Does the Equipment Have?
This separates professional equipment from cheap knockoffs. The FCC regulates signal boosters to prevent network interference. Legitimate vendors only sell FCC Part 90 certified equipment and hold approval from carriers (Verizon, AT&T, T-Mobile publish approved booster lists).
Ask to see certifications before purchase. Uncertified boosters can damage carrier networks and land you with legal liability.
What Happens if the Booster Damages My Building's Network or Causes Interference?
Reputable vendors carry liability insurance and warrant their work. If their booster causes dropped calls network-wide or interferes with 911 services, they should cover remediation costs and fines. Ask specifically:
- Is your company insured against network damage claims?
- What's your warranty if the system causes interference issues?
- Do you monitor the installation for FCC compliance?
This separates accountable vendors from one-off resellers who disappear after payment.
What's Your Return or Performance-Guarantee Policy?
Request a written guarantee: if speeds don't improve by a measurable threshold (typically 2–3 bars of signal or 10+ Mbps), you can return the equipment within 30 days for a full refund. Many quality vendors offer this; discount resellers rarely do.
Comparing vendors across these questions takes time, but Mercoly lets you gather responses from trusted signal booster providers in one place, saving hours of back-and-forth calls.
Frequently Asked Questions
Q: Can I install a signal booster myself, or do I need a professional? Basic boosters with indoor antennas are DIY-friendly if you're comfortable with basic electronics, but outdoor antenna placement requires measuring signal strength at multiple points—professionals get better results with spectrum analyzers. For complex buildings or multi-unit systems, professional installation is worth the $300–$800 cost.
Q: Will a signal booster work if there's literally no signal outside my building? No—boosters amplify weak signals; they can't create signal from zero bars. If you have no outdoor signal, you need a femtocell (carrier-provided) or distributed antenna system instead.
Q: How much should I expect to spend total for a residential booster setup? Budget $300–$1,200 for equipment plus $300–$800 for professional installation, depending on your building size and booster quality.
Find certified signal booster vendors and compare quotes instantly on Mercoly.