GA pilot reported a recurring (ads-B) automatic dependent surveillance - broadcast reception failure...

Attributes
ACN	1540746
Time
Date	201805
Local Time Of Day	1201-1800
Place
Locale Reference	HQZ.Airport
State Reference	TX
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Cessna Single Piston Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	Other All Phases
Route In Use	None
Flight Plan	None
Component
Aircraft Component	Traffic Collision Avoidance System (TCAS)
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Instrument Flight Crew Commercial
Experience	Flight Crew Last 90 Days 45 Flight Crew Total 1900 Flight Crew Type 1700
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy

Narrative:

Ads-B reception failure - transmissions per public ads-B performance report (papr) reports indicate good reception of ground station(s) of my ads-B system. When I depart hqz to the southwest I rarely; if ever; receive any ground stations below the 3;500 level under class B until I pass west or south of the cedar hill tv antennas. The ads-B ground station located just west of the cedar hill antennas seem to be blocked by those antennas; because as soon as I'm south or just west of the towers; area aircraft suddenly appears on my screen monitor. I have noticed this for 6 years of adsb in/out equipped. Strangely; I can pick up airborne traffic (adsb out and non-adsb out) while taxiing on the ground at hqz; but as soon as I'm airborne; the non-adsb out traffic disappears. I also have ipad mini with wingx (communicating with my adsb in/out unit) that indicates number of adsb ground stations being received; which remains at zero during these events; then pops to as many as six stations.typically; I never see traffic while in the vicinity of hqz [and] while in the pattern. A definite safety of flight issue with those that think ads-B will show them all traffic. The FAA map shows coverage at 500 feet AGL in the dfw area.

Original NASA ASRS Text

Title: GA pilot reported a recurring (ADS-B) Automatic Dependent Surveillance - Broadcast reception failure below 3500 feet seemingly due to antennas blocking the ground stations' signal.

Narrative: ADS-B reception failure - transmissions per Public ADS-B Performance Report (PAPR) reports indicate good reception of ground station(s) of my ADS-B system. When I depart HQZ to the southwest I rarely; if ever; receive any ground stations below the 3;500 level under Class B until I pass west or south of the Cedar Hill TV antennas. The ADS-B ground station located just west of the Cedar Hill antennas seem to be blocked by those antennas; because as soon as I'm south or just west of the towers; area aircraft suddenly appears on my screen monitor. I have noticed this for 6 years of ADSB in/out equipped. Strangely; I can pick up airborne traffic (ADSB out and non-ADSB out) while taxiing on the ground at HQZ; but as soon as I'm airborne; the non-ADSB out traffic disappears. I also have IPad mini with WingX (communicating with my ADSB in/out unit) that indicates number of ADSB ground stations being received; which remains at zero during these events; then pops to as many as six stations.Typically; I never see traffic while in the vicinity of HQZ [and] while in the pattern. A definite safety of flight issue with those that think ADS-B will show them all traffic. The FAA map shows coverage at 500 feet AGL in the DFW area.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

GA pilot reported a recurring (ads-B) automatic dependent surveillance - broadcast reception failure below 3500 feet seemingly due to antennas blocking the ground stations' signal.