The member in front is using an L-Tronics Little L-Per, a type of radio direction finder.
From the en.wikipedia.org
A radio direction finder or RDF is a device for finding the direction to a radio source.
From the en.wikipedia.org
A hand-held radio direction finder, the L-Tronics Little L-Per, is used by ground teams to search for downed aircraft.
From the en.wikipedia.org
The Lancetilla's electronic gear gave out, including the speed indicator and the radio direction finder, requiring navigation by dead reckoning.
From the time.com
If you wander too far from where you can find your primary objective, a special direction finder will appear on the screen to help put you back on track.
From the usatoday.com
The exhibition focussed on Bradfield, and included a glass direction finder on the observation level, and various important heritage items.
From the en.wikipedia.org
So tell me then, if the Irish government was so inclined towards the allies, why did it allow Dublin to be used by the Luftwaffe as a direction finder for Belfast?
From the independent.co.uk
Thereafter playing in the final match was scarcely an option, that particular digit acting both as shock absorber and in the case of players such as Dilshan, direction finder.
From the guardian.co.uk
Before the hunt, compute distances in every direction with a range finder or by pacing off the range to set points.