Signal GH3.0.8 - App Store

Signal GH is a tool for users of the HDHomerun networked digital TV tuner who want to monitor and improve their Over The Air (OTA) reception quality. It graphs signal quality from multiple channels simultaneously, allowing a user to more rapidly adjust and upgrade OTA receiving hardware, i.e., cables, connections, splitters, pre-amps, and antennas.

Snapshot the state of your system using the Experiments tab to keep track of what worked and what didn't work.

United States users also have the benefit of a map of digital television broadcasting towers. Depends on the accuracy of your device's compass.

If you don't have an HDHomerun, you don't need this product. If you do have an HDHomerun, and use it for over the air reception, you will likely find it useful.

If the automatic scan does not find a station you expect, tap on the station's real digital channel in the unused channel column under Settings.

Signal GH does not support QAM (digital cable) Please make sure your HDHomerun is set to use a broadcasting channel set and not a cable channel set.

You cannot use this software to watch video on your iOS device. This is a diagnostic tool.

Version History • Location button in map tab needed to be updated
• Updated the map data
• The tinted icon was not drawing as expected. 3.0.8 09/22/2025 • Large update to Map Database
• Minor text changes 3.0.7 02/09/2025 • Rebuilt TV database to support modern FCC database import
• Fixed some minor robustness bugs
• Added alternative tinted icon 3.0.6 09/29/2024 • User reported a crash while using the Experiments tab 3.0.5 06/15/2024 • Updated map to include ATSC 3 broadcasters
• Showing only tuners 0 and 1 as ATSC 3 capable, where applicable.
• Layout changes in the settings and experiments tab 3.0.4 11/27/2023 * Report of app crashing on some devices. Attempting to minimize that crash. 3.0.3 03/20/2023 • Channel selection menu had been flickering on iOS 16
• Updated broadcaster database 3.0.2 09/21/2022 • Improvements when NextGenTV (ATSC 3) stations are scanned including not showing 00 on channel button
• Tidied up interface
• Plex systems apparently do not tune exactly to the assigned frequency for a digital channel (Don't know what they are thinking over there), now accept these frequencies as being the closest digital channel
• Put vertical color legend bar next to graph
• Various layout improvements including improved behavior at larger type sizes
• Made the circle graphs larger
• Because several people told me that the channel button at the bottom wasn't obvious enough, appended a menu icon to let folks know its function.
• The refresh tuner list button had been disabled when there were zero tuners.
• Newer HDHomeruns provide a decibel reading for signal strength and quality, displaying that in the tuner detail view.
• Show an alert when attempting to tune to an ATSC 3 channel from the non-ATSC 3 supporting tuners of an HDHomerun 4K
• Try to avoid using the non-ATSC 3 supporting tuners on an HDHomerun 4K during experiments or initial scans 3.0.1 08/06/2022 • New UI for the Signal Tab
• New Experiments Tab
• New Onboarding experience
• Updated Map Tab UI
• New Settings UI
• New Documentation Tab
• Experimental support for ATSC 3
• New icon 3.0 06/04/2022 • Updated for discovering HDHomeRuns on local networks 2.3.6 05/30/2021 • Returned contours for US TV broadcasting towers on the map
• It had been possible to get stuck when reading the no location explanation
• Tidied up the UI colors 2.3.5 03/15/2021 • Fixed crash where manual address of HDHomerun matched subsequent discovered address
• Better handle user denying local network access
• Location manager permission dialog had been disappearing before user could agree
• Better handling of case where user allows reduced location accuracy (disable compass in such cases) on map
• Added location issues button to map 2.3.4 01/04/2021 • Fixed crash while running upcoming operating system
• Fixed font issue in the level gauges
• Updated towers database 2.3.3 06/26/2020 • Fixing crash when onboarding under iOS 13 while manually choosing channels
• Fixing crash when onboarding with no tuners available for scanning
• Fixing crash when tuners become available while showing the bar charts on iOS 13. 2.3.2 01/10/2020 • Bug fixes
• Minor UI adjustments.
• Made dynamic tables more reliable on iOS 13.
• Possibly fixed a rare crash when a station improperly specified a sub channel name.
• Updated towers database 2.3.1 01/07/2020 • Support for light and dark themes
• Support for Dynamic Type
• Fixed longstanding issue where channels wouldn't be remembered across restoration from backup
• Variety of fixes related to the FCC channel repack. 2.3 10/13/2019 • Added reminders of ongoing repack of broadcast channels in the USA.
• Tapping on the tower detail view was not opening it as expected.
• Updated map database.
• Cleaned up table layouts.
• Sped up rate of checking the device status. 2.2.3 04/12/2019 • Stability improvements
• Maps updated to try to keep up with ongoing FCC "repack" of allocated channels.
• Some map stations, especially translators will show the incorrect real channel as the repack settles down. 2.2.2 03/13/2019 • Updated towers database
• Tweaked appearance on devices without home buttons. 2.2.1 01/31/2019 • Updated towers map to a more modern UI.
• Fixed a variety of defects.
• Updated the towers database. 2.2 10/21/2018 * Updated U.S. transmission tower database. 2.1.8 01/31/2018 • Updated HDHomerun library
• Allow for slide to delete manually entered tuners
• Updated TV database 2.1.7 09/23/2017 •Added refresh tuners button to the main interface
• Updated the towers database
• Changed the layout of the tower detail panel 2.1.6 07/05/2017 • Cleaned up several glitches in the UI.
• Manual selecting of channels wasn't working in settings.
• Status bar wasn't visible after on boarding.
• Rescan nng channels was not picking up new channels 2.1.5 10/26/2016 * Scanning for tuners was unacceptably slow, scanning for channels was abominably slow. My apologies for the bug. 2.1.4 09/15/2016