In an attempt to stop propagating “bad gouge” and circular research, I will endeavor to put accurate references and footnotes here on some key items.
This is also your Required Reading List.

This will be a work in progress.  In no particular citation order for now:

1) MACSOG Document Study, Draft, 10JULY70, MACSOG Communications; Appendix G, Declassified, as redacted. www.dod.gov/pubs/foi/reading_room/520-17.pdf

2)   The Lonely Vigil by Walter Lord.  Coast watchers in the Solomons.

3)   Military Communications, A Test for Technology, The US Army in Vietnam, John D Bergen, Center of Military History, United States Army, 1986

4)   The US Army in WWII, The Technical Series, The Signal Corps, The Test.  Ken Roberts Greenfield, Department of the Army, 1957

5) The US Army in WWII, The Technical Series, The Signal Corps, The Outcome. George Thompson, Department of the Army, 1966

6)  The Escape Factory, Lloyd R. Shoemaker, 1990

7)  MACSOG Document Study, Draft, 10JULY70, Maritime Operations; Annex D to Appendix C, Declassified, as redacted.

8)  Coastal Raiders, Mr Tran Do Cam; as translated, former OIC PTF’s 2 and 11, RVN  2000

9)  Janes Fighting Ships, 1975

10)  Deleted  See Ref (15)

11)  First into Nagasaki:  The Censored Eyewitness Dispatches on Post-Atomic Japan and its Prisoners of War George Weller, Anthony Weller, Walter Cronkite

12)  Conduct Under Fire:  Four American Doctors and their Fight for Life as Prisoners of the Japanese, 1941-1945.  By John Glusman

13) Know Your PT Boat The Bureau of Ships, US Navy, Technical Publication No. 9, NAVSHIPS 250-222-1, 15 JULY 1945.

14) Motor Torpedo Boats, Tactical Orders and Doctrine Headquarters CinC U.S. Fleet, July1942

15)  WWW.PTFNASTY.COM Excellent website full of PTF info

16)  WWW.WARBOATS.ORG Another excellent website with PTF info

17)  PT Boats At War, World War II to Vietnam Normal Polmar, Samuel Morison, MBI Publishing Company 1999.

18) The Gulf Raiders, Tran Do Cam; May 2000. Tran was a PTF skipper in the RVN Navy providing an excellent, unique operational narrative.

19) Receivers and Transmitters RT-66/GRC, RT-67/GRC and RT-68/GRC Technical Manual TM11-289 Department of the Army

20) Deleted. See Reference (31).

21) The Surplus Handbook: Receivers and Transmitters, Caringella and Clark; Editors and Engineers Ltd., 1959.

22) Navaho Code Talkers: WW2 Fact Sheet; www.history.navy.mil

23) www.cryptomuseum.com An excellent Dutch website with good references to the RS-6 set

24) www.williammaloney.com See Bill’s excellent website on military museums and much more.

25) Twilight Warriors: Covert Air Operations Against the USSR;  By Curtis Peebles

26) Vietnam Declassified: The CIA and Counterinsurgency  By Thomas L Ahern Jr., Thomas L Ahern

27) Spycraft: The Secret History of the CIA’s Spytechs, from Communism to Al-Qaeda By Robert Wallace, H. Keith Melton, Henry R. Schlesinger.

28)  In Love and War  James Stockdale and Sybil Stockdale, Oct 1984

29) Reference Data for Field Radio Communications, ST-11-174, 1 June 1962, HQ, US Army Signal School Fort Monmouth NJ.

30) Jane’s Military Communications

31) Vietnam Studies: Division Level Communications 1962-1973, LTG Charles R. Myer, Department of the Army, 1982

32) Private communications with a PTF radioman (USN) who was a crewman in the 1969-70 timeframe in Da Nang.

33) COMUSMACV Command History, 1966, Annex M; Declassified, as redacted.

34) Black Ops, Vietnam: The Operational History of MACVSOG Robert M. Gillespie

35) Proposed Plan for Intelligence Coverage in Alaska in the Event of an Invasion (Stay-Behind Agent Program)
(Documents referred from the FBI to the Air Force for release disposition), 1947-1954;  US Air Force Office of Special Investigations

36)  Field Manual FM24-24 Radio and Radar Reference Data Headquarters, Department of the Army, December 1983

37)  Technical Report No.67-01, Radio Set AN/PRC-64, Development and Test Program Final Report, Stanley D. Peirce, April 1967, US Army Limited War Laboratory, Aberdeen Maryland 21005

38)  Eyes Behind the Lines, US Army Long Range Reconnaissance and Surveillance Units, Global War on Terrorism Occasional Paper 10, Maj. James F. Gebhardt US Army (Ret.) Combat Studies Institute Ft. Leavenworth Kansas, Undated (Circa 2005)

39)  Infantry Communications Data, ST 7-180-FY73, United States Army Infantry School, Fort Benning Georgia, 13 October 1972

40)  Final Report AN/PRC-64, JRATA Project No. 1A-105.0, 15 May 1965, Army Concept Team in Vietnam

41)  75th Ranger Regiment Association History website  http://www.75thrra.com/history/a75_hx.html

42)  Field Manual FM31-20 Special Forces Operational Techniques, Headquarters, Department of the Army, December 1965

43) AID/NASA Pilot Project for Technology Transfer To A Developing Nation – Republic of Korea – Korea Institute of Science and Technology, Report Number CK-17-326, June 1972

44) SOG The Secret Wars of Americas Commandos in Vietnam. John L. Plaster, New American Library, 1997

45) The ARRL Antenna Book, American Radio Relay League, Newington CT, 1994, updated periodically

46) Measurement of the Attenuation of Radio Signals by Jungles, Jack W. Herbstreit and W. Q. Crichlow, RADIO SCIENCE Journal of Research NBSJUSNC-URSI
Vol. 68D, No.8, August 1964

47) Semi Annual Report, Remote Area Conflict Research and Engineering, Advanced Research Projects Agency, Project AGILE, 1July63-31DEC63. DTIC Report AD348219 1FEB64

48) EUCA61-966 Dispatch, Declassified. List of communications equipment caches delivered to Austria. Chief EUCA to Chief of Station, Vienna. June 26, 1961
/specialCollection/nwcda3/67/GRCROOND GRREPAIR VOL. 2 (GRCROOND SUPPORT)/GRCROOND GRREPAIR VOL. 2 (GRCROOND SUPPORT)_0162.pdf

49) REDSOX/CACCOLAS Final Report EGMA-5939 Chief of Mission, Frankfort June 9. 1953 CIA FOIA Release
/specialCollection/nwcda3/61/AESAURUS AENOBLE VOL. 2/AESAURUS AENOBLE VOL. 2_0023.pdf

50) AEQUOR II Progress Report EGMA 00713, Chief of Base Munich, Sept 29, 1952 CIA FOIA Release
/specialCollection/nwcda3/60/AEQUOR VOL. 1/AEQUOR VOL. 1_0032.pdf

51) Man Pack, Team Pack, HF Military Radio Sets Report, Ft Monmouth Signal Corps, Author Unknown, Forwarding memo AMSEL-RD-MAA, 12 August 1965

52). Special Forces At War Shelby Stanton, Zenith Press, 1990, reprinted 2008

53)  AN/GRC-109 The first True Special Forces Radio, Gene Williams, Southern California Sentinel, Special Forces Association Chapter 78, Volume 6, Issue 2, February 2015

54) PT Action Reports, letter from Commander South Pacific Force to Commander Pacific Fleet, Serial A16-3(90) 0035(I), SECRET, 23October43.

55) pronto.au.104.org The online website history of the Royal Australian Corps of Signals in Vietnam.

56) A Users Guide to Aircraft Radio Corporation Receivers, M.W. Tauson. Published on the Internet. Undated.

57) Norwegian Troms Forsvarsmuseum Military Museum, Tromso Norway. http://mtmu.no/museer/temamuseer/troms-forsvarsmuseum/

58) Personal communication with Sam Rodriquez, LRRP/Ranger veteran RTO user of the TRC-77 radio sets.