EC145 helicopter pilot reported an near midair collision with a fixed wing aircraft.

Attributes
ACN	1453953
Time
Date	201706
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	EC145
Operating Under FAR Part	Part 135
Flight Phase	Initial Climb
Route In Use	Direct
Flight Plan	VFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Private Flight Crew Instrument
Experience	Flight Crew Last 90 Days 27 Flight Crew Total 2530 Flight Crew Type 30
Events
Anomaly	Conflict NMAC
Miss Distance	Horizontal 300 Vertical 100

Narrative:

While performing helicopter emergency medical services (hems) operations at a hospital; I lifted from the hospital helipad to return to home base. The hospital helipad sits virtually equidistant between [two] airports. Both airports operate on separate unicom frequencies; but are only 11 NM apart. Considering [one of the airports] to be closer I made a unicom takeoff call on [their frequency] as well as with company dispatch radio; all the while monitoring [the other frequency] on the 3rd radio for any traffic making calls; none were heard on [the second frequency]. On initial climb from hospital (with no response to unicom call on [either frequency]); TCAS sounded a proximity alarm and a low flying east-bound fixed wing was spotted approaching from my 9 o'clock at the same altitude. Evasive maneuvers were performed by both aircraft and collision was avoided. I then resumed my climb and northwest flight and landed uneventfully at base.

Original NASA ASRS Text

Title: EC145 helicopter pilot reported an NMAC with a fixed wing aircraft.

Narrative: While performing Helicopter Emergency Medical Services (HEMS) operations at a hospital; I lifted from the hospital helipad to return to home base. The hospital helipad sits virtually equidistant between [two] airports. Both airports operate on separate Unicom frequencies; but are only 11 NM apart. Considering [one of the airports] to be closer I made a Unicom takeoff call on [their frequency] as well as with company dispatch radio; all the while monitoring [the other frequency] on the 3rd radio for any traffic making calls; none were heard on [the second frequency]. On initial climb from hospital (with no response to Unicom call on [either frequency]); TCAS sounded a proximity alarm and a low flying east-bound fixed wing was spotted approaching from my 9 o'clock at the same altitude. Evasive maneuvers were performed by both aircraft and collision was avoided. I then resumed my climb and northwest flight and landed uneventfully at base.

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.