GA PLT ISSUED A CLRNC TO TAXI INTO POS AND HOLD THEN LOST RADIO CONTACT WITH LCL CTL. ACR ON FINAL APCH GIVEN A GAR.

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I WAS CLRED INTO POS AND HOLD TO RWY 26L AT PHX; I WAS TOLD TO EXPECT AN IMMEDIATE DEP/TKOF CLRNC DUE TO AN ACR MLG ON FINAL. I TAXIED ONTO RWY 26L AND WAITED FOR A TKOF CLRNC. SILENCE. AFTER CONTINUED SILENCE I QUERIED THE TWR; 'ARE WE CLRED FOR TKOF ON 26L' -- THE RESPONSE CAME BACK 'YES; CLRED FOR IMMEDIATE TKOF. CANCEL THAT REMAIN IN POS; ACR GAR.' ONLY SECONDS EARLIER I HAD CLRLY HEARD MY CLRNC TO POS AND HOLD; THEN ONCE ON THE RWY I MUST HAVE GOTTEN INTO A RADIO BLIND SPOT FOR I HEARD NOTHING UNTIL I QUERIED THE TWR. LATER THE SAME DAY I CALLED PHX TWR TO SPEAK WITH THEM ABOUT IT. THEY TOLD ME THAT THEY HAD MOVED THEIR RADIO ANTENNAS 2 MONTHS PRIOR AND THEY WERE HAVING DIFFICULTIES HEARING ACFT IN THAT AREA ON THE GND CTL FREQS BUT HAD NOT HAD ANY PROBLEMS IN THAT AREA WITH TWR FREQS. I WAS TOLD THAT THEY WOULD RPT THE DIFFICULTY AS I RPTED IT TO THEM. APPARENTLY THE TWR HAD GIVEN ME 3 TKOF CLRNCS. NONE OF WHICH I HEARD. I HAVE TAKEN OFF ON THAT RWY BEFORE WITHOUT ANY RADIO BLINDSPOT PROBLEMS.