ROTARY WING AIR TAXI; AMBULANCE; HITS GUY WIRE MAKES FORCED LNDG.

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I DEPARTED MEDICAL CTR; ZZZ IN A HELI; ON AN EMS FLT WITH A FLT NURSE AND MEDIC. WE LANDED AT A HOSPITAL; AND PICKED UP A PATIENT TO BE TRANSFERRED TO A HOSPITAL; IN XYZ. WE LEFT WITH A CEILING OF 700 FT AND VISIBILITY OF 4 MI. OUR HDG TO THE HOSPITAL WAS 341 DEGS AND ENRTE WX WAS 700 FT TO 800 FT AND 2-4 MI VISIBILITY. ABOUT 23 MI FROM XYZ ARPT I MONITORED ATIS AND FOUND THE CEILING AND VISIBILITY AT THE ARPT TO BE 600 FT AND 2 MI. I DISCUSSED GETTING AN IFR CLRNC WITH THE MED CREW; BUT DECIDED I COULD MAKE IT VFR. I THEN CONTACTED APCH CTL AND THEY HAD ME SQUAWK AND IDENT 20 MI S OF THE ARPT AT 1400 FT MSL. AFTER ANOTHER 2 MINS I CONTACTED THE HOSPITAL AND LET THEM KNOW WE WERE ABOUT 5 MINS OUT AT 9 MI. I SLOWED THE ACFT TO 90 KTS AND AS I WAS SLOWING; MEDCOM CALLED FOR A POS RPT. I TOLD THEM I DIDN'T HAVE TIME RIGHT NOW AND LOOKED DOWN TO SET MY SELECTOR SWITCH BACK TO APCH CTL. WHEN I LOOKED UP AGAIN; ALL I SAW WAS A CLOUD FOR 1 OR 2 SECONDS. AS I WAS GETTING READY TO XMIT FOR AN IFR CLRNC; I BROKE OUT OF THE CLOUD TO SEE A TWR TO MY R FRONT AT APPROX 500 FT TO 1000 FT. I IMMEDIATELY TURNED 20 DEGS TO THE L AND MOMENTARILY HEARD THE MAIN ROTOR STRIKE ONE OF THE GUY WIRES. I FELT A SLIGHT LATERAL VIBRATION AND CONTINUED A L DSNDING TURN INTO A 10 KT SOUTHERLY WIND. I FOUND AN OPEN FIELD AND AFTER VERIFYING MY ROTOR WAS STILL IN THE GREEN; DID A PWR-ON APCH TO THE FIELD. AS I WAS LNDG; I GAVE A MAYDAY CALL TO APCH. AFTER LNDG AND FINDING ALL PAX SAFE; I EXECUTED AN EMER SHUTDOWN. I THEN CONTACTED AN ACFT TALKING TO APCH AND RELAYED OUR EXACT LORAN COORDINATES. AFTER SHUTTING DOWN THE ACFT; I UNPLUGGED THE BATTERY AND WITHIN 20 MINS HELP HAD ARRIVED. OUR PATIENT WAS TRANSPORTED BY GND AMBULANCE TO THE HOSPITAL. I KNEW THE WX WAS MARGINAL WHEN I DEPARTED; SO I REVIEWED MY OPTIONS FROM OUR COMPANY OPS MANUAL. THESE INCLUDE LAND IMMEDIATELY; DIVERT TO ANOTHER LOCATION; TURN AROUND AND GO HOME; GO IFR. IN RETROSPECT I KNOW I WAITED TOO LONG TO ELECT 1 OF THE 4 OPTIONS. I SHOULD HAVE EITHER LANDED OR ASKED FOR AN IFR CLRNC AND LANDED AT THE ARPT. I LET MY ATTN DIVERT TO MAKING RADIO CALLS INSTEAD OF FLYING THE ACFT. IN THE FUTURE I WILL NOT HESITATE TO LAND OR ASK FOR A CLRNC MUCH SOONER IN A DETERIORATION SIT.