Question: Which American magazine covered topics related to amateur radio and radiocommunication experimentation, Modern Screen or QEX?

Context paragraphs:
Five Nine: Five Nine (also referred to as 59) was a monthly magazine published in Tokyo, Japan.  The magazine covered topics related to amateur radio DXing and contesting.  It was published in Japanese and was mainly distributed in Japan.  The name of the magazine is derived from the international amateur radio RST code report of 59, indicating the highest level of signal readability and signal strength.  The 59 signal report is commonly used in radio DXing, regardless of the actual signal readability or strength of the station receiving the report.

Amateur radio operating award: An amateur radio operating award is earned by an amateur radio operator for establishing two-way communication (or "working") with other amateur radio stations. Awards are sponsored by national amateur radio societies, radio enthusiast magazines, or amateur radio clubs, and aim to promote activity on the amateur radio bands.  Each award has its own set of rules and fees.  Some awards require the amateur radio operator to have contacted other stations in a certain number of countries, Maidenhead grid locators, or counties.  Because amateur radio operators are fobidden by regulation to accept financial compensation for their on-air activity, award recipients generally only receive a certificate, wooden plaque, or a small trophy as recognition of their award.

QEX: QEX is a bimonthly magazine published by the American Radio Relay League.  The magazine covers topics related to amateur radio and radiocommunication experimentation.  The magazine features advanced technical articles on the theory, design, and construction of radio antennas and equipment.  The magazine is published in English and has a worldwide subscription base.

Federacion de Radioaficionados de Cuba: The Federacion de Radioaficionados de Cuba (FRC) (n English, Cuban Amateur Radio Federation) is a national non-profit organization for amateur radio enthusiasts in Cuba.  The FRC claims that 98% of all Cuban amateur radio operators belong to the organization.  These members are organized in 180 local amateur radio clubs that are affiliated with the Federacion de Radioaficionados de Cuba.  Key membership benefits of FRC include a QSL bureau for those amateur radio operators in regular communications with other amateur radio operators in foreign countries and sponsorship of amateur radio operating awards and radio contests.  FRC acts as a liaison between Cuban amateur radio operators and Cuban regulatory authorities.  FRC is the national member society representing Cuba in the International Amateur Radio Union.

Pakistan Amateur Radio Society: The Pakistan Amateur Radio Society (PARS) is a national non-profit organization for amateur radio enthusiasts in Pakistan.  PARS operates a QSL bureau for those amateur radio operators in regular contact with amateur radio operators in other countries, and supports amateur radio operating awards and radio contests.  The Pakistan Amateur Radio Society represents the interests of Pakistani amateur radio operators before national and international regulatory authorities.  PARS is the national member society representing Pakistan in the International Amateur Radio Union.

Organisasi Amatir Radio Indonesia: The Organisasi Amatir Radio Indonesia (ORARI) (in English, Amateur Radio Organization of Indonesia) is a national non-profit organization for amateur radio enthusiasts in Indonesia.  According to a 2000 census compiled by the International Amateur Radio Union, Indonesia has the thirteenth-largest population of amateur radio operators in the world.  A key membership benefit of the ORARI is a QSL bureau for those Indonesian amateur radio operators in regular communications with other amateur radio operators in foreign countries.  The ORARI represents the interests of Indonesian amateur radio operators before Indonesian and international regulatory authorities.  ORARI is the national member society representing Indonesia in the International Amateur Radio Union.

Modern Screen: Modern Screen was an American fan magazine that for over 50 years featured articles, pictorials and interviews with movie stars (and later television and music personalities).

South African Radio League: The South African Radio League (SARL), formerly known as the South African Radio Relay League (SARRL), is a non-profit organisation representing the interests of amateur radio enthusiasts in South Africa.  The SARL advocates on behalf of its membership and all licensed amateur radio operators in South Africa as the representative of amateur radio to the South African government.  This has included the promotion of deregulation and simplification of the amateur radio service, and expansion of the number of amateur radio operators in Southern Africa.  The SARL publicises and promotes the role of amateur radio in society, and promotes the use of amateur radio in schools as an entry point into the fields of science and technology.  SARL publishes a magazine called "Radio ZS" six times a year.  SARL is the national member society representing South Africa in the International Amateur Radio Union.

Old man (magazine): old man was a bimonthly magazine published by the Union of Swiss Short Wave Amateurs as the membership journal of the organization.  The magazine covered topics related to amateur radio.  The magazine was published with articles in three languages: German, Italian, and French.  The magazine drew its subscription base primarily from Switzerland.  The journal was published in A5 paper size with a full color cover and black-and-white print on un-coated newsprint inside.  The final issue of the magazine was published in November/December 2007, after which the organization discontinued publication in favor of a new membership journal called "HB Radio".

Deutscher Amateur-Radio-Club: The Deutscher Amateur Radio Club e.V. (DARC) (in English, German Amateur Radio Club) is a national non-profit organization for amateur radio enthusiasts in Germany.  As of 1 January 2008, the organization had 35,773 members, approximately 60% of all licensed amateur radio operators in Germany.  Key membership benefits of the organization include QSL bureau services, a monthly membership magazine called "CQ DL", and the promotion and sponsorship of radio contests.  DARC promotes amateur radio by organizing classes and technical support to help enthusiasts earn their amateur radio license.  The DARC also represents the interests of German amateur radio operators and shortwave listeners before German and international telecommunications regulatory authorities.  DARC is the national member society representing Germany in the International Amateur Radio Union.

Supporting paragraphs: Modern Screen QEX
Answer: QEX